Malicious PDF — malware analysis report

Static analysis result for SHA-256 de58d9f5ed7e36c1…

MALICIOUS

PDF

75.7 KB Created: 2021-03-26 08:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa63f7e50642f642b8e7ecaf7072ee41 SHA-1: d39d7bb29a5e2a8ffcb0242edec68e40619cc5db SHA-256: de58d9f5ed7e36c14c54d897aaab060007276cf9e8cd486cb64b3a08a5721b90
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm and a ClamAV signature indicating a phishing trojan. The document contains numerous external links, with the primary suspicious URL being https://bologen.ru/wix?keyword=reading+spark+plugs+for+nitrous. The presence of a link farm suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=reading+spark+plugs+for+nitrous
    • https://cdn-cms.f-static.net/uploads/4384164/normal_603c4ae913eb2.pdf
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/f3f549a16416b2.pdf
    • http://penageli.getenjoyment.net/75581165599.pdf
    • https://tesurupijirixu.weebly.com/uploads/1/3/0/8/130813669/zirapojegifow.pdf
    • https://matatotasewitux.weebly.com/uploads/1/3/1/3/131384286/zugesajaw.pdf
    • http://xivazokib.medianewsonline.com/wejale.pdf
    • https://cdn-cms.f-static.net/uploads/4373986/normal_6058b58c1d404.pdf
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/3212193.pdf
    • https://diwekapuxejube.weebly.com/uploads/1/3/1/4/131455019/3c11eb1ab21b.pdf
    • https://static.s123-cdn-static.com/uploads/4459470/normal_5fe13c18e87f2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/suxugipipolazog/samsung_un50ku6300fxza_wont_turn_on.pdf
    • https://uploads.strikinglycdn.com/files/90917818-c1eb-4e69-8a28-733b251da1a6/insinkerator_66_installation_instructions.pdf
    • https://s3.amazonaws.com/vezumobigodub/bafazasobugevesupudepiloj.pdf
    • https://s3.amazonaws.com/sobaketemu/2244813871.pdf
    • https://s3.amazonaws.com/fosawef/xujawi.pdf
    • https://uploads.strikinglycdn.com/files/6188863b-9a14-4dcf-b3f3-8732e8a9100f/weber_smokey_mountain_supplies.pdf
    • https://s3.amazonaws.com/rakabexozu/sa_520_analytical_procedures.pdf
    • https://s3.amazonaws.com/lakujusitejojet/calories_in_bojangles_chicken_fingers.pdf
    • https://uploads.strikinglycdn.com/files/a944a82c-014a-49ed-81b9-43205bbd1d87/free_math_word_search_puzzles_printable.pdf
    • https://uploads.strikinglycdn.com/files/c711f94b-017e-4161-a592-a416ae3a1cd9/cyberpunk_2077_gameplay_leak_watch.pdf
    • https://s3.amazonaws.com/fukezavazuj/aha_stemi_guidelines_2019.pdf
    • https://uploads.strikinglycdn.com/files/bc904765-5f3a-465e-a70a-3981886ae909/west_bend_automatic_bread_and_dough_maker_recipe_book.pdf
    • https://s3.amazonaws.com/lepefi/lawalib.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_off0000eaf4.bin
4dee97d23f800e423f2dc09f209e744b29513228faee30152de28d60bc209ad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 5280 bytes
font_01_sfnt_off0000fd0a.bin
377cce6140fee00a6f1a6c5cc1f6111d8e83d3b799ead158d2ff96bca6012c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 10692 bytes

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