Malicious PDF — malware analysis report

Static analysis result for SHA-256 281a37df1007fdf1…

MALICIOUS

PDF

85.6 KB Created: 2020-11-29 07:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 41ce47d612d619f79c6c2d07a7fa4806 SHA-1: b9f1c85411b35b5dec7ea98420379618d3968d97 SHA-256: 281a37df1007fdf13dbd7db1233e54137c170c0aecbd6897e81ae46cf324d8e4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. One prominent URL, 'https://trafftec.ru/strik?utm_term=aroma+arc-3000sb+manual', is embedded and likely serves as the primary lure. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/strik?utm_term=aroma+arc-3000sb+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5fb73670e6daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f8914784f85d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5fbeee9870f6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5f96b9fcf0d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5f9b178428812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_5fb822bcec6e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_5fad9ce5addad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_5fa24a4e2ba5c.pdfIn PDF document text
    • https://lisiladojorinin.weebly.com/uploads/1/3/0/8/130874519/zuluzugiv-kusuxipanamar-xomusafimuli.pdfIn PDF document text
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/wotuvezitogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_5f9b292b7b8ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • https://s3.amazonaws.com/kujapomib/ash_manor_school_new_uniform.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
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E3 5412 bytes
SHA-256: c123e8288cca721b45db3fefb7eb7b4899b6ec6bb417649281b0a046ba01d420
font_01_sfnt_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 20800 bytes
SHA-256: bba9576470de41e535966f17569f857e7b0191683ead4d5680742beb5432ade8
font_02_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 8856 bytes
SHA-256: 3cbf7236a7071ccc620f50c2bec5e5b7360e63a853494b6571b658c5d874f6c5
font_03_sfnt_off0001250c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250C 10728 bytes
SHA-256: 3513a2667ca5af823c07b61699aa8295ef6fb85ca3dacbf9d5cf6915d108bc5b

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