Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8eb9bec4db0853…

MALICIOUS

PDF

88.9 KB Created: 2021-04-17 17:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9e0d6927922ae152b42ee871a984b068 SHA-1: 59b64a288e84059aa7a914769a3468d33a66da59 SHA-256: bd8eb9bec4db0853668a9d40044cab6e142a72c1fbd46eae51da7e4f10cf2f23
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=will+portland+see+snow+this+year In PDF document text
    • http://gazzsheff.xyz/day_and_night_worksheet_for_grade_1ui66p.pdfIn PDF document text
    • https://cdn.sqhk.co/lozosasuxe/Rgdghjj/larva_heroes_lavengers_2018_mod_apk_hack.pdfIn PDF document text
    • http://bnl-jobs.com/337665132206brkb.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/34159371138.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/bum_bag_pattern.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/eWd4ae3/gitako.pdfIn PDF document text
    • http://sadipize.scienceontheweb.net/91218987338.pdfIn PDF document text
    • http://pefilimozol.iblogger.org/83095656673.pdfIn PDF document text
    • http://gonojokolekovo.22web.org/16138645708.pdfIn PDF document text
    • http://wowitaly.pro/posibevas95y6z.pdfIn PDF document text
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/e391d4f83425.pdfIn PDF document text
    • https://gededojoseg.weebly.com/uploads/1/3/4/3/134341448/lavuvidenejinef.pdfIn PDF document text
    • http://mekozeka.66ghz.com/37680650577.pdfIn PDF document text
    • http://maleev.online/937541776729pqs.pdfIn PDF document text
    • http://xobezised.iblogger.org/wodevegegavu.pdfIn PDF document text
    • https://diniporugixufov.weebly.com/uploads/1/3/1/8/131856235/6577115.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/bib5ghx/bewuminimejinisag.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/gczzfha/smith_s_hours_of_operation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_1abe1fae1d214ff18a0f5cc2b526c56e.pdf?index=trueIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_226d1feb46f34133998602b3c8689ff9.pdf?index=trueIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_6204951e6e46481aa482f8e007a3d5d3.pdf?index=trueIn PDF document text
    • http://piwolimosopobu.myartsonline.com/putabowosesodigelup.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_ea58321fb91a4fc796c49ec30177f33f.pdf?index=trueIn PDF document text
    • http://sopavame.onlinewebshop.net/bitter_kola_and_honey.pdfIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_48298d89876e416f8bd6b38efabcc1f8.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
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 5040 bytes
SHA-256: a10a49ec8f53295a451f9f5c20c88599564599c4648a678efa9450255aac4159
font_01_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 11476 bytes
SHA-256: 26642cf04b8e35638596f2ab1ee252eeea31737fb28d49981e544604e6ea75b1
font_02_sfnt_off000130ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EF 16544 bytes
SHA-256: 1b44218257806f750c7fedc2cca84b6b30ff477c2da870f9e14c0541087d9c9f
font_03_sfnt_off00014732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14732 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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