Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f648c2a537f34a9…

MALICIOUS

PDF

72.0 KB Created: 2020-12-02 20:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f9be1d357b8153be27da246ce1523007 SHA-1: 15c5e7c0c0be4ba524708b10d126609e1c337308 SHA-256: 2f648c2a537f34a909b3bc9c4af6a435e793b3e7bb84fe6d713264f7f781ef1a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with the primary link pointing to 'traffset.ru/strik'. This behavior is indicative of a link farm or phishing lure, designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

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://traffset.ru/strik?utm_term=socket+system+calls+in+network+programming PDF link annotation
    • https://riwetomawojok.weebly.com/uploads/1/3/4/5/134516188/8206282.pdfIn PDF document text
    • https://xotuwajugi.weebly.com/uploads/1/3/4/3/134349857/gumogebirazed.pdfIn PDF document text
    • https://pelusebilad.weebly.com/uploads/1/3/4/2/134234641/4a42552663e0.pdfIn PDF document text
    • https://bolefapazudakaj.weebly.com/uploads/1/3/4/4/134478960/fataruferidazuwobe.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/5fc5a0ccdf132613bbddba36/t/5fc6ed3da3696915e216a341/1606872382176/parenting_tips_for_single_dads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c01dee-cd28-40cb-9401-83e050141ce1/curso_de_refrigeracion.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/u_words_to_describe_someone_positively.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8cb23de-7e60-4436-b5b6-b0f4b508e49b/10.sC4B1nC4B1f_palme_fizik.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1c77e6609fd0ee7979b9c/t/5fc4eea26457125654d658ce/1606741666945/ascension_lutheran_church_marion_iowa.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/68833893910.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf2a8ec0a1d2b4e54c094/1606218408371/prince_of_tides_book_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2378e5e7-42a2-4b6a-9cc7-d43615ea11a4/bileiklerin_yaygn_adlar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b712ae-f22f-42d3-b3b0-0335ea2302da/teacup_french_bulldog_rescue.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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 5612 bytes
SHA-256: 570b7f6eb93aec75ec461216695c3a97ddca4b6286bed389cf9d631dac10e218
font_01_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 10632 bytes
SHA-256: c354ae299f0bab57fa146c374ffb25a50785124a1feeb63b329ea2cc09deb647

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