Malicious PDF — malware analysis report

Static analysis result for SHA-256 4403d44aff29004e…

MALICIOUS

PDF

83.1 KB Created: 2021-03-19 07:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38442818899be92f02a0d43dcb544988 SHA-1: 59cc2c90ffd2a8c6fa353dd4f70cea5b881edfe1 SHA-256: 4403d44aff29004ef6d0ed7cbb5b08633bea064799247c97eb4e98f45dd92721
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are related to SEO and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The presence of a 'SE_URGENCY_LURE' heuristic suggests the document may employ deceptive tactics to encourage user interaction. ClamAV detection and ML classification confirm the malicious nature of the file, pointing towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/wix?keyword=direct+payday+lenders+no+third+party+in+ky
    • http://novonet.online/how_to_wear_baby_forward_facing_in_ergo_360gozhl.pdf
    • https://cdn.sqhk.co/lididiregi/jdBRjiY/82462093824.pdf
    • https://cdn-cms.f-static.net/uploads/4482426/normal_5fe78850ba0e1.pdf
    • https://cdn.sqhk.co/dajebala/OFdgeij/86893010760.pdf
    • https://static.s123-cdn-static.com/uploads/4425009/normal_5fe2be3414217.pdf
    • http://kkkirrreeee.space/93493895968l6t0v.pdf
    • https://cdn.sqhk.co/lituxopevuk/1GRd2ps/54269141923.pdf
    • http://1xbet-sportstavki.fun/2005_jeep_grand_cherokee_5.7_hemi_trail_ratedva06r.pdf
    • http://cupe1.ru/holes_human_anatomy_and_physiology_lab_manualxcmjh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/02f0d33f-987a-4e4d-a716-bac7d8e69920/tubixo.pdf
    • https://uploads.strikinglycdn.com/files/2ec8c4b6-003d-4696-bbeb-b5b384a5b27b/how_to_set_acurite_indoor_outdoor_thermometer.pdf
    • https://uploads.strikinglycdn.com/files/ba2b2b08-6136-47cf-aa86-1a1ed6df901f/best_college_for_interior_designing_in_delhi.pdf
    • https://uploads.strikinglycdn.com/files/e0b2e2ab-3c50-4e9c-b328-95241f550ad9/act_test_booklet_order_form.pdf
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_27aa8486df2e4f358d6cd070e4bd93b3.pdf?index=true
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_2dc57379e38e47a7b5d63bfa52e45ea9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/93e632d3-d98b-4289-a3f0-1cbea30fd7b4/38728628185.pdf
    • https://uploads.strikinglycdn.com/files/021d8109-1d37-424b-936c-520be77573f4/schwinn_bikes_for_sale_australia.pdf
    • https://uploads.strikinglycdn.com/files/cc990f44-8938-4228-b8d0-b7dc5c866965/sex_education_season_3_trailer_netflix_ita.pdf
    • https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_738f159c2c02487e8121285ba09369ad.pdf?index=true
    • 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_off00010698.bin
59a4932ae5902e055e2abc18b6c9526cbc0c1bd2a81cab6ee42d2e541c064186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 5328 bytes
font_01_sfnt_off000118ba.bin
b53cfbde4f173af26f9cab8651cbbe0f94d450c6df3b7fca1e28e304080d9d55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 11376 bytes

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