Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d11fd0be5c66bda…

MALICIOUS

PDF

73.7 KB Created: 2021-01-04 23:18:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: eb84a12a519f31745a36e1f1eb90d273 SHA-1: 64c5cbf3f4634620a065355d1d345980f0d0bb40 SHA-256: 6d11fd0be5c66bdaf3f344edd482deefecf7328bffb58b7a090dba4ef5659955
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm and a high ML score. It contains numerous external URLs, suggesting an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs indicate a likely phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffking.ru/123?utm_term=room+recess+games+reading PDF link annotation
    • https://retuxuzuj.weebly.com/uploads/1/3/4/6/134688644/gafejerijogof.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/d5d70b.pdfIn PDF document text
    • https://litisenos.weebly.com/uploads/1/3/1/0/131071047/zixuwuxexogela.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/aebca45c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_5fda7cabc076a.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/9hgHfUD/car_race_track_around_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/igeieii/sumo_bot_ev3_rules.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/jigexarowa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/away_in_a_manger_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/78312914131.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/viniwevupanapid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c84ce05d-6f4a-4fa4-a95f-485156fbe1c4/36990617312.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/nojobomekigi.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/31896419319.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_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 5232 bytes
SHA-256: 573cf9b82ead9de55bca0e85f0b351825f14304474f7fba8feec0d9157e725e9
font_01_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 10300 bytes
SHA-256: b22a629e3fdeaa5dd40110bdbd5ef802c75fd3fa641e4ac7d0d8afc87ed6763b

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