Malicious PDF — malware analysis report

Static analysis result for SHA-256 943994a4600b6e4c…

MALICIOUS

PDF

85.0 KB Created: 2021-05-16 15:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 155c2a16e8999dceed592030fa6c46fc SHA-1: 64fe0fb6eb079d155bd7e5907e7aa1bfd3dd5047 SHA-256: 943994a4600b6e4c3f4402807ff07f9a6f771aa71e490c8f4deb897ba4728a6a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=html5+textarea+pattern+validation PDF link annotation
    • https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/kiwexuzezuxa_lidupadizalevu_xigerimux_jakorowabu.pdfIn PDF document text
    • https://zanefasijim.weebly.com/uploads/1/3/5/9/135965469/3021619.pdfIn PDF document text
    • https://wozibasibif.weebly.com/uploads/1/3/4/8/134868806/lewol_bonuramupiso_lodafumis_xajosolepa.pdfIn PDF document text
    • https://jeputuzomum.weebly.com/uploads/1/3/1/3/131398597/mipudi-netozalobujixu.pdfIn PDF document text
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/xakoxisenules.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/d673b848cca979d.pdfIn PDF document text
    • https://rawuvuxa.weebly.com/uploads/1/3/4/0/134019107/4616eeb.pdfIn PDF document text
    • https://bavopasivivewid.weebly.com/uploads/1/3/0/7/130738836/donukigorizet.pdfIn PDF document text
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/bevuwilawaren_soratuwunefilo_rejevozev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_35c3e99d5a6c4ed7ab92c52c2827f9b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satulibaren/aluminum_sheet_farming_persona_5.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_82805116ff7644c5b226c06b68d121a1.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_ca2b01a4cc90403fa3c8d5589160e4fd.pdf?index=trueIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_5ee4a74049d1498a8533caf36842d73e.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_9cf00b2029864d3091de265e6c628457.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/when_you_wish_upon_a_star_sheet_music_violin.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/what_type_of_strategy_does_nike_use.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/straight_answer_meaning_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/292252c1-1b37-4686-8c19-9f035381370f/24502376620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eec98a1-600d-4f0a-b207-b035c9c2b602/75358617490.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_7d3c75a928e54cc88616aa68a13b7c67.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidenigad/anemia_falciforme_cure_naturali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94594cbe-57fd-4bf8-b55e-78b86d0cafee/singer_featherweight_221k_manual.pdfIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_29c2b20bf8d34c3d95aadd1de36b71e9.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 5140 bytes
SHA-256: af82feea292dda100c782d901d959740102edfcd96683951511e4377c11be2dd
font_01_sfnt_off00011bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 12620 bytes
SHA-256: d733cb0f2acec65f2be7bdcf70cb642e5ff0fcb402c87f5ef9273ba0b9d9bc18

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