Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa36fe7ae2268960…

MALICIOUS

PDF

99.8 KB Created: 2021-06-07 00:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1ac8d4ecf0e0890e581c45320f7d5c40 SHA-1: e036968e195addbce127e65334a76b4a1e48e1e8 SHA-256: fa36fe7ae2268960ca5727df9fbf78dba7d32e469e261298c0ec1d4c19ce1091
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains numerous external links, suggesting it functions as part of a link farm or SEO spam operation. The embedded content, though heavily obfuscated, likely serves to disguise the true purpose of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/pbw?utm_term=ejercicios+resueltos+de+estructura+repetitiva+while PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384325/normal_606e9d4562254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390055/normal_600430b984068.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/kovemufipipixatem.pdfIn PDF document text
    • https://vidixudex.weebly.com/uploads/1/3/4/7/134774160/5939365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_605f95314f4ca.pdfIn PDF document text
    • https://vuvudosav.weebly.com/uploads/1/3/4/5/134579130/249604b185.pdfIn PDF document text
    • https://duzaguzu.weebly.com/uploads/1/3/1/4/131406181/8479674.pdfIn PDF document text
    • https://xuserufibizu.weebly.com/uploads/1/3/4/1/134131258/neloma.pdfIn PDF document text
    • https://bibawegosisuzu.weebly.com/uploads/1/3/5/9/135961680/e45f6.pdfIn PDF document text
    • https://masenajeronuzes.weebly.com/uploads/1/3/1/6/131637464/c9bbda2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_6010f0fc5840e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5fe9cc4d3ee35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371808/normal_5fdca451ce6f1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4528876/normal_60b1ae23954a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_6016b499e669f.pdfIn PDF document text
    • https://wavixupenug.weebly.com/uploads/1/3/4/3/134386336/pigozaxirilazo-rijunobuxojap.pdfIn PDF document text
    • https://pijewiki.weebly.com/uploads/1/3/5/9/135966210/4727539.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://uploads.strikinglycdn.com/files/0022ce5b-b77b-46ec-a41e-726e462e8c51/sozurugatikugutomobaxebe.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/w/file/fetch/144719382/seseg.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/f/xuwipareg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e011d6-fa21-4dcd-b36f-353362cdb2e9/63008181154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965eabdd-7f64-4795-9a0a-1a37d9a0d22c/89557849511.pdfIn 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_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 5120 bytes
SHA-256: 1121d98274a8556e273dd3d159b8c9e8bee15461ceb43710c07018ce768ac055
font_01_sfnt_off000131ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EF 13084 bytes
SHA-256: b056ac365cb6152a3cf32e91e51ee639feb29d6e2a421846c9f64379cd0f38fb
font_02_sfnt_off00015be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE1 16216 bytes
SHA-256: ed7a5fe29cddfc02e3d41c4db1bce6756a44f24e1fd69d3ab4408e2cae19555c
font_03_sfnt_off0001712b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1712B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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