Malicious PDF — malware analysis report

Static analysis result for SHA-256 646dc6193f860b4b…

MALICIOUS

PDF

84.6 KB Created: 2020-11-21 02:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: da3154aaa7dc3be42bbd2db7bc980cda SHA-1: eebd91acf78c4b5dc971da587052c2cf3096f3a9 SHA-256: 646dc6193f860b4bcb3609e553977062a647ba9b988214a8367302c839be254b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/123?utm_term=recruiter+behaviors+have+the+largest+impact+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405930/normal_5f979795aa093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5fa9a1e03aadd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_5fb85e449fd58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456393/normal_5fa0c1aa3d619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_5fb275389592c.pdfIn PDF document text
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/bokititotujizum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef614c65-5e03-4531-a7c5-9f6c2bfbcab6/naguvewerizowititijej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e925ea-45c0-4be2-b3bc-cd0b18c98610/mixipevezukifedopuf.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/32049592203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bd9a5d-baaf-4c27-beac-2e88979d4e8c/pilgrim_at_tinker_creek_chapter_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3526a49b-bae9-4482-900e-f5062e4f684d/jefanetanajabanen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7df270-d777-400b-a7b7-5a6ce7665be6/liquidos_miscibles_e_inmiscibles.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/game_of_sultans_cheat_codes.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 5552 bytes
SHA-256: 085df154facfef991b3f2d2f852004b331054d6753a6e1c3955354d1b70e6e24
font_01_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 10940 bytes
SHA-256: fb37d5bfa58a8826d02f7c981e9686dd11118d69e5fe843980a87acbecd5fd24

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