Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4a74af47692b27…

MALICIOUS

PDF

80.3 KB Created: 2021-03-11 04:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5004b34a47630076160937ccc346b334 SHA-1: d2d0c9535c92a682af502eff45a49485af3f5a3d SHA-256: 5e4a74af47692b273406f7efbad55cf33c2d4fbb8c0874b4da74537e36d5a2a1
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 0.9998

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://jottigo.ru/wix?keyword=manual+testing+interview+questions+for+freshers+2019 PDF link annotation
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/9007191.pdfIn PDF document text
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/4187e.pdfIn PDF document text
    • http://pulibibebobo.iblogger.org/82750269790.pdfIn PDF document text
    • https://tonakojevidi.weebly.com/uploads/1/3/0/7/130775970/ridasatawuned.pdfIn PDF document text
    • http://legendbilisim.com/batla_house_movie_tamilrockers_hd_720p75cho.pdfIn PDF document text
    • http://onlinetyz.xyz/tinudokdr8n8.pdfIn PDF document text
    • https://dinowupeguf.weebly.com/uploads/1/3/1/3/131379410/2760593.pdfIn PDF document text
    • http://kosufezegaxid.iblogger.org/christmas_carols_notes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_6480de28b54c48efb98f780d4c55c77e.pdf?index=trueIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_87be916300a246eb99e4b90e6ad440ec.pdf?index=trueIn PDF document text
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_344545d6fcf34d61840401de9f0e00e3.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_4717d5d7b61d4d64a8ec713c9a6a14c8.pdf?index=trueIn PDF document text
    • http://bonizeza.epizy.com/avast_vpn_not_working_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/el_tratado_de_bucareli.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/napipetenubegulanexiso.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_72b1ec25cd684c55bef83e270f3371a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dalava/lejojemepoveweko.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/company_share_certificate_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/94744528604.pdfIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_b37b59f46f1740458af9602de982072d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 5796 bytes
SHA-256: 9672128aa55832f39623cce7abafe8d08701528271f561268f43a33b629aca5d
font_01_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 10664 bytes
SHA-256: bba055bd23041ebcfa4e50afc8fa48e33cb4803f8c026d744bc02a16377b03d6

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