Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a76abb5df79d2d…

MALICIOUS

PDF

76.6 KB Created: 2021-05-28 23:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6ec47c89576614f78ca3872aa0096f61 SHA-1: 6c60aabf3cd575a189bd791c6ce7e2d04c87e329 SHA-256: b2a76abb5df79d2d03e8c3da3b14cbb8dd97c835a870ed7896d70165b91c293f
246 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including brand impersonation for phishing and a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The embedded URLs and the structure suggest an attempt to redirect the user to a phishing site or to download a secondary payload, likely exploiting a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/8809655.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://zajinet.ru/123?utm_term=bharat+gas+application+form PDF link annotation
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/8809655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470029/normal_6058cbba3bf77.pdfIn PDF document text
    • https://feravenokitaj.weebly.com/uploads/1/3/6/0/136095553/katatoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_6058dda68fc5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451563/normal_5ff64e4acf29e.pdfIn PDF document text
    • https://dikubone.weebly.com/uploads/1/3/4/6/134603537/4615aeccf037b.pdfIn PDF document text
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/tijokoxaxoparif_bajemo.pdfIn PDF document text
    • https://vakurizilobiwil.weebly.com/uploads/1/3/0/9/130969742/rakewif.pdfIn PDF document text
    • https://xuxukuked.weebly.com/uploads/1/3/5/3/135318060/jowatajewu.pdfIn PDF document text
    • https://tixasenuwafoja.weebly.com/uploads/1/3/4/6/134658158/3085895.pdfIn PDF document text
    • https://voliguxuzewiwa.weebly.com/uploads/1/3/4/7/134762967/8136aac6c61c16.pdfIn PDF document text
    • https://lekinimogasujif.weebly.com/uploads/1/3/0/7/130739945/79834ac25.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/be508f8bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8586a413-8818-43e5-a926-aeda0a1d9e4b/boy_scout_first_aid_merit_badge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6219f998-7330-4dec-91b6-97782c1c3dcc/2017_kawasaki_ninja_300_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4043f6cb-97a5-425d-ae5e-b31b9e1a44bb/71223101979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c806471b-bca8-42a2-80a1-8a20903925d4/download_python_machine_learning_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeec4d4a-f98d-44e1-9b6d-9e31b812f4e0/1754142086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bfe3380-25cd-483e-a50e-740414957985/vudalutifusofolexito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d81db5-7c50-4f04-9701-c40258c68d63/banulusetofin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c80368c-d37b-4911-adaf-2ae6ef8a66f2/lekazewo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 5480 bytes
SHA-256: b48fe369b9c6c22bca8e4fb6ae85c277b051e0d46734df2dd9610adcbb496429
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 11040 bytes
SHA-256: 0cc4f0074f08760abbeaf2c857e3261b6e39283db4703657b0571dda2802ab6c

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