Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04fa68a09bd13e6…

MALICIOUS

PDF

76.9 KB Created: 2020-12-22 20:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 832123f811f3f85bf90a4542b256a58e SHA-1: 860c2ad86702de6e371192f3eaf2ca69ac23a390 SHA-256: c04fa68a09bd13e6899bad4f00a3eeab49aae9177a819f507bea569e45ce068f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' pointing to 24 external PDFs. The primary URL, 'trafffe.ru', is suspicious and likely serves as a lure. ClamAV and an ML classifier also flagged this PDF as malicious, indicating a phishing or malware distribution intent.

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://trafffe.ru/aws?utm_term=using+properties+of+parallel+lines+worksheet PDF link annotation
    • https://bejokuwawij.weebly.com/uploads/1/3/4/6/134688199/8969770.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/musoxifuvitalo/lesoleruweputos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5b7abe-b529-482a-87d0-1c5253108fd8/75988110881.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc79b839866a15ab3def02/t/5fdce41638a54414684a5a1c/1608311830574/molig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c75055d-46e4-4633-a7ab-2b015cda6a10/daxudejudetugop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce547a90e5b06becb6a36f/t/5fd103931f86e027fbac4fd7/1607533460287/slice_food_delivery.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/ironman_construction_guide_osrs_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/orthopedist_definition_md.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/29369790919.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/ladies_platform_brogue_shoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70057615-75ce-43b3-8886-a5ba58340b3a/ap_human_geography_chapter_10_vocabulary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193c9e7e-1a5c-43ad-86c8-2f6846ea4361/koxobutolawojakalok.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 5312 bytes
SHA-256: 231bafe64099b027e14dd29961c24a72da5d791857254664b8c64c9b48d9edf8
font_01_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 11404 bytes
SHA-256: b1aea495f6c042b30882c80c4de34795133539571ccd0639a4f2f1f56861fe32
font_02_sfnt_off00011121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 16208 bytes
SHA-256: 314c85c55222e9c47571dccce4b967dbed516664fd4a23da38c55357a676f718

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