Malicious PDF — malware analysis report

Static analysis result for SHA-256 646cf60d3065e28f…

MALICIOUS

PDF

86.6 KB Created: 2021-03-25 13:31:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a23b492f3b99df290b4e91d4ff32c442 SHA-1: fd4bc1f165f471a1d3f16446402f8a8efc563bec SHA-256: 646cf60d3065e28fc0fe5923d0bdbb367e253e633ac2fc883780b48e037bd90b
146 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect the user to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kuzutuzo.ru/strik?utm_term=taotao+110+atv+for+sale PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4503214/normal_5fd04524c084f.pdfIn PDF document text
    • http://shimano-stradic.ru/52919132838el8t1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_605942183287c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_5fcd767ed62f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443810/normal_601a56f117546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_602293e7e92d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459177/normal_5fdc0fcd73a60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_60563c9a8c0b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_5fdc179ced1ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_60390151c5b8f.pdfIn PDF document text
    • http://genusttwsr.fun/mewaroxudc2q79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490132/normal_5fcc5cd42c893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489255/normal_6056015822188.pdfIn PDF document text
    • http://wersita.fun/honor_online_store_malaysiavwe97.pdfIn PDF document text
    • http://familyit.pro/alevines_tilapia_roja0ethf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_602b52ba27b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5fd7225a023cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426955/normal_5febfaf02e250.pdfIn PDF document text
    • http://praktika-ingenieur.com/adminlte_bootstrap_templatesknico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460678/normal_603299cc660ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491945/normal_5ffc4aaa5f704.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/23970c6a-ffb4-4ea7-8ef1-dab725a0a2eb/madame_butterfly_snapdragon_seeds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995a051e-c563-489f-8816-bbb7e6cfe785/can_cops_get_into_your_snapchat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb3b6b5-4134-458d-a795-a9c1c09107f1/nufunekikapipozoxuwako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d11e679-3084-464a-a334-61d5e42e86c9/83513023524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7adcdee9-3609-43cf-b630-eb78c82dd759/75048250107.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_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 4964 bytes
SHA-256: ff464a5223f4dc8e937991ae662e020652004361054480b76452aecf18ad37fa
font_01_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 11236 bytes
SHA-256: a9d8d78fcce90ca593c92305f5e44711fbc336090d70c117e59a8005033d0345

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