Malicious PDF — malware analysis report

Static analysis result for SHA-256 382c4da0a76c021f…

MALICIOUS

PDF

71.4 KB Created: 2020-12-16 04:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68f51a9f08498c61ec52ff03b93b6440 SHA-1: 1dc57d44f369f5a922dc3d3ed9d44d7e8ab19509 SHA-256: 382c4da0a76c021f001e482e0453dc29a327a61f7075064099dbaa19784b1b71
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The presence of embedded URLs and the ML classifier's high confidence score suggest a malicious intent to direct users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of phishing or SEO abuse tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=gate+valve+vs+ball+valve+aquarium
    • https://cdn-cms.f-static.net/uploads/4487194/normal_5fd7b00144659.pdf
    • https://limikasideg.weebly.com/uploads/1/3/4/4/134446439/xewefov.pdf
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5fbf11f343117.pdf
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f87aa477a4ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ff20e27a-5f44-4d6c-a5c1-a9dd1ba77a0a/manual_for_comcast_dta_remote.pdf
    • https://uploads.strikinglycdn.com/files/5b4f163b-c071-4b29-a14b-7f97e3062889/bajobopep.pdf
    • https://uploads.strikinglycdn.com/files/2600de2d-57b2-4de3-9a9b-d2f3eea68308/37272158983.pdf
    • https://uploads.strikinglycdn.com/files/4df45200-ced1-4d48-abf7-d8d7ad754247/bay_area_chinese_bible_church_alameda_ca.pdf
    • https://s3.amazonaws.com/novipaliwid/executive_summary_word_document_template.pdf
    • https://uploads.strikinglycdn.com/files/f71d9405-e677-47af-ad58-80ea6c691029/ramusobezadexix.pdf
    • https://uploads.strikinglycdn.com/files/a3e3ba86-9f53-46ef-b433-a6cb694c58bc/93134081339.pdf
    • https://uploads.strikinglycdn.com/files/90f654d0-8cd3-4896-bdb5-1bdaa78fc75e/chick-fil-a_honey_peppercorn_salad.pdf
    • https://uploads.strikinglycdn.com/files/f31a64d8-bc52-41c2-bf8a-3bd982b12f27/rubik_cube_finger_tricks.pdf
    • https://uploads.strikinglycdn.com/files/08d1c6a0-021a-46c2-be0a-e5581c2b149e/30292334941.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da36.bin
1f4fe566d54657b8b56f34bd8502a1f44ce8561347c9a84419a29642f2749f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 5188 bytes
font_01_sfnt_off0000ebd3.bin
ec5adad3f687c087b74b5df5fa4696d5a801179c691a3a32e8cd8d5754c64778		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 10948 bytes

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