Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c764667865096a…

MALICIOUS

PDF

64.2 KB Created: 2020-12-19 01:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9985ec32bcc1bee86f71fb792f76328d SHA-1: f6c46eef2b0e26bdec39f2ecbd8982c798937276 SHA-256: 68c764667865096ab5c0517d9e37ef9e85d1f9a864d509a25b59fb6e18d8996f
252 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting sites, masquerading as an answer key to lure victims. The 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics indicate a phishing or SEO poisoning campaign. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely leading to further compromise.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffine.ru/aws?utm_term=12th+computer+science+public+answer+key+2018 In PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/c9c98d.pdfIn PDF document text
    • https://jilibawijoza.weebly.com/uploads/1/3/4/3/134363321/pulogefise-begenebugo-lexetakinuk.pdfIn PDF document text
    • https://biditeso.weebly.com/uploads/1/3/4/3/134339176/budaposola.pdfIn PDF document text
    • https://serofewaz.weebly.com/uploads/1/3/1/3/131379274/5147721.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/5881179.pdfIn PDF document text
    • https://vutizimowunofe.weebly.com/uploads/1/3/4/3/134354130/piluruniwobepo_pabuxufiselura.pdfIn PDF document text
    • https://xazebalewez.weebly.com/uploads/1/3/4/7/134766000/a5032b5ec35bf3.pdfIn PDF document text
    • https://dikabapor.weebly.com/uploads/1/3/4/6/134620412/8348101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5fa09de26acf4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc55f6d5bcb0228a2a0640f/t/5fc7128c2ac13f1ee9b29d5c/1606881932663/road_racing_world.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/vezawifivi.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_off0000bb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2A 5996 bytes
SHA-256: 7feb94a4b1ff4645e00edd512e34f961f27f3885d2ebf8c921007e2b8cd48cdd
font_01_sfnt_off0000cf7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7F 10748 bytes
SHA-256: e09172efb9c87a89cb0274c7189631407f6ae3739ec2139a9751ba695f265b5b

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