Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93b0630e36beeb2…

MALICIOUS

PDF

77.4 KB Created: 2021-02-21 06:13:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3a00610741b8dc11b987322a5df66b17 SHA-1: f52260ce6b8f1ff52a0861e6eb1fc36c9239dc18 SHA-256: a93b0630e36beeb200c1def458073d1826dae71e80ebb5fa108e578e52ef82d4
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous external PDF links, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic indicate a lure to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/123?utm_term=wgu+c207+task+1 PDF link annotation
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/2334229.pdfIn PDF document text
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/sepegunegidudumami.pdfIn PDF document text
    • http://vorgazme.com/39186016657rjpij.pdfIn PDF document text
    • https://mobofapewapo.weebly.com/uploads/1/3/5/3/135399527/waxes-ledufutodixo.pdfIn PDF document text
    • http://gk-kuban.ru/macmillan_primary_grammar_2_pupils_book7ohlh.pdfIn PDF document text
    • https://likojekiputisi.weebly.com/uploads/1/3/4/5/134576895/a33b7254.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474977/normal_5fc83f92b57c8.pdfIn PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/jixadedavetorufa.pdfIn PDF document text
    • https://nemaxololele.weebly.com/uploads/1/3/5/3/135304154/zavat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5ff955fe6c3b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_5fd1ee143712e.pdfIn PDF document text
    • https://sisebixa.weebly.com/uploads/1/3/4/6/134625325/c73b14e2a63eeb.pdfIn PDF document text
    • http://latencfsrt.space/21076028365ozf9t.pdfIn PDF document text
    • https://mitigovoponezix.weebly.com/uploads/1/3/4/3/134375948/wobole-xavipivuripog-xefapuwusinolum.pdfIn PDF document text
    • https://dewuvibemezifo.weebly.com/uploads/1/3/4/7/134763410/4063000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_600ca21a7d105.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/sefabe/55763593150.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/lumulujifomuxuzolif.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_off0000e4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A6 4824 bytes
SHA-256: 06d19bc24ddf85818f9fd2a4969344426086be23561bdb2a0ab1e957d94b626b
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 10868 bytes
SHA-256: 7cfa54a6e5d8b176a570572e4dbcb74243cfd022f90203bcbc67f9b1fdd7d243
font_02_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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