Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8d91488895b1e0…

MALICIOUS

PDF

79.1 KB Created: 2021-02-24 23:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c61c9a8e0bae2cda38eaa6addfe88ef6 SHA-1: 426956c7d9c186fe77a8a9808cd7b8d9609f2aa0 SHA-256: 0d8d91488895b1e09716e7f136af5c1b2b6850dc2f54c21a2e0ee281164f4c63
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links suggests an attempt to direct users to potentially malicious or SEO-manipulated content, aligning with phishing or spamming tactics.

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://jacksth.ru/wix?keyword=are+debugging+and+troubleshooting+the+same PDF link annotation
    • https://cdn.sqhk.co/loxexafetivu/dUChjig/robots_des_moines_iowa_weather.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_60142dc8802a9.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/ghm1jf1/gedugevif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405639/normal_5ff5d9f696837.pdfIn PDF document text
    • https://vabakapis.weebly.com/uploads/1/3/1/4/131453405/ligevixino-gikizudekup.pdfIn PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/dd509d2753c.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/idjW5ji/60943719031.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/40c6d980bbd3d.pdfIn PDF document text
    • https://zojunakalej.weebly.com/uploads/1/3/2/6/132682915/e7d24079d023aa.pdfIn PDF document text
    • https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/b0f1a.pdfIn PDF document text
    • http://kernig.online/physics_punjab_textbook_class_12bn63t.pdfIn PDF document text
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/4796fd250a9.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/refesipabowivimes.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://s3.amazonaws.com/vuzotisenixava/87242132373.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/the_7_spiritual_laws_of_success_book.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/zewogodixerikuretixabida.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 5252 bytes
SHA-256: fa55efbaaedfddb71d68bc2f839d3d60cf35ff06c34e3a6d3e6f1db8b03a8850
font_01_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 9972 bytes
SHA-256: 33bf8a615ab11ffcef25e28f0fe902ddcd207f052841b65cdc9f7386cb63986f
font_02_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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