Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ab081903c64fd0…

MALICIOUS

PDF

99.5 KB Created: 2021-04-20 02:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3b48c812a4fb540954fd3076be170c51 SHA-1: 870f5c0035d143a147e4e01441b08c59cd747a88 SHA-256: b2ab081903c64fd0e246411de3120e6b86e26262ea038e69b5d5026a41956ab1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=a+level+chemistry+paper+5+notes+pdf PDF link annotation
    • http://ketosimple.online/750622411986eubp.pdfIn PDF document text
    • http://select-get.top/temple_run_oz_online_free_downloadue0wd.pdfIn PDF document text
    • http://gagewetero.iblogger.org/food_and_beverage_definition.pdfIn PDF document text
    • http://pixxel.life/63366956092jtvxi.pdfIn PDF document text
    • http://trokot-newshop.online/year_planner_template_2016_freeoahbq.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/Vxjgflk/22778217393.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/djchenQ/jibanuvuxujelis.pdfIn PDF document text
    • http://sukujemegamog.22web.org/51461021596.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/34648168962mq92r.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/CenjeRh/semilla_de_calabaza_propiedades.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/ifgjJig/dofej.pdfIn PDF document text
    • http://teaitalis.space/56250396985knlwo.pdfIn PDF document text
    • https://cdn.sqhk.co/zumovinej/eiihah0/vetikigawuliwiwu.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/575096332954wxc7.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/47416970652gyooi.pdfIn PDF document text
    • http://inmyshtangen.xyz/mefabenidudemazuboze6sdzy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_a280c8c488e042c5ab5a3c7395e5cb18.pdf?index=trueIn PDF document text
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_e072074f391f417798441c38ddf23105.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_6960514483424c20936f6c2ab49f2ab1.pdf?index=trueIn PDF document text
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_6dc0bacd789542288250a2ddc6ed79ed.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_5e7bcb6368a34ab1956bca65f0f85f7f.pdf?index=trueIn PDF document text
    • http://sonatufekofefab.rf.gd/dajosevidofufed.pdfIn PDF document text
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_c9b24fe896f64e7d97fdd61069171f63.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_cf65a382ea1745a68744d0d52b93279a.pdf?index=trueIn PDF document text
    • http://bijivarewexobu.rf.gd/4976661266.pdfIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_b302a82d9f2849d79bde4a6146a0183b.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 6704 bytes
SHA-256: 6c07c753364955eb7d697c065538e0725da12367c1b4d134fc31a8ca05bd6684
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 4384 bytes
SHA-256: 12adbf1b9739b647a989ad69bc2972c451c5c6037b232292e054bc4c135365f6
font_02_sfnt_off000115f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F6 5668 bytes
SHA-256: 085a77ab505b34de8972db79b5a9c194409341f90cf0a71ec1f471219a52d532
font_03_sfnt_off00012926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 14364 bytes
SHA-256: 5ac206ffe649dab8c75b740e5c70abb12c6156df05fbc8b39013dbd9474024db
font_04_sfnt_off000158de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DE 16628 bytes
SHA-256: d77c05be9ead16b980ca3ec58e666f76999613f0ca45fac4f819cb750524e4af
font_05_sfnt_off00016fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FB9 6108 bytes
SHA-256: 7daffd672d2d12701054703934ad1ae4f31b9559c41c904ff26f4556067ba45d

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