Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8edd09c695362e…

MALICIOUS

PDF

76.2 KB Created: 2021-03-21 10:06:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: fd551a041839b96ea062f8b9a33f4b45 SHA-1: e1d4a7aef4268a8facece8dd79fcfbdbb8386a4f SHA-256: 9a8edd09c695362e9354b110d7c86465df98632ee8373dcf2f4a3c760647220b
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm designed for phishing or malware distribution. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically flags it as a credential phishing lure, impersonating a brand and directing users to a malicious redirector. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to exploit vulnerabilities or trick users into downloading further malicious content, aligning with common phishing and exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://tejiwubatimi.weebly.com/uploads/1/3/4/8/134899102/84070e164.pdf.
  • 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://gimoguvi.ru/wix?keyword=blood+composition+and+function+worksheet PDF link annotation
    • https://tejiwubatimi.weebly.com/uploads/1/3/4/8/134899102/84070e164.pdfIn PDF document text
    • http://xrootunited.com/fomerihgoa.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/budijuju_xalimalawe.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/bifSif5/vagid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379385/normal_5ff575018246a.pdfIn PDF document text
    • http://xruhdfo.site/goxuvumuzuf7mf8t.pdfIn PDF document text
    • https://jitugexe.weebly.com/uploads/1/3/0/9/130969989/kugogex_satazewinudevul.pdfIn PDF document text
    • https://repositugi.weebly.com/uploads/1/3/0/7/130738607/dasujike.pdfIn PDF document text
    • http://tikovg.xyz/gejiwubovogi7j3cl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449968/normal_6045e42303411.pdfIn PDF document text
    • https://wepejusekubikur.weebly.com/uploads/1/3/4/4/134441987/3381219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_604f117826914.pdfIn PDF document text
    • http://esportzmlevent.com/tusesizaxatovelazedejufoir2jn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411923/normal_6003be47d0c57.pdfIn PDF document text
    • https://cdn.sqhk.co/lediname/ighhqXR/speedometer_app_android_auto.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/jb3fqHs/piano_man_sheet_music_easy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_8df228d775c94c35bd2747fccb14484d.pdf?index=trueIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_c571ca40e1324047afff58ab1c639cfb.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_8142c1986e0e42f285d02d1c66f53310.pdf?index=trueIn PDF document text
    • https://eeff404e-5492-4914-a1d7-e39d1f35e6b2.filesusr.com/ugd/e58d70_3202cb328d11445a8a0a23b5e56f44e3.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_457c5e603046459ba0baf3e4b2ffcb0d.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_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 5600 bytes
SHA-256: 000c0b9325e05de33fb1798388d9213d11afa4ebb931af28e1fbb54611519be4
font_01_sfnt_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 10840 bytes
SHA-256: ceaaaaccb023016edd07e549dcddae33a4adf867d8ac85e39e89fa124f9989e8

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