Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2f09650df4903a…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 03:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2a41f8e85b018adc6d39cecea78599fd SHA-1: 617a0b2b88cc04764712504ac9103b432c147ddf SHA-256: 4d2f09650df4903ac4824fb4fcc9589c4850e86c93d3853898de37fc91a9e9bb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL leading to a redirection service. This suggests a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier flagging indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://jacksth.ru/strik?utm_term=family+feud+rules+to+win+car PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376870/normal_6042457b03b6e.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/2139c61effd7bb2.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/goxub_dolagomiven.pdfIn PDF document text
    • https://kukusekiwija.weebly.com/uploads/1/3/5/3/135389364/e3478dcbf10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426261/normal_5ff9769875f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5fd9cafc2f2a1.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/zoxefakutad.pdfIn PDF document text
    • https://lebotisoko.weebly.com/uploads/1/3/4/5/134597635/ec7220b50ef45.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/28f9f7380ac7d15.pdfIn PDF document text
    • https://felipivi.weebly.com/uploads/1/3/1/8/131856333/pelusuf.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/4498717.pdfIn PDF document text
    • https://mokowevabib.weebly.com/uploads/1/3/0/7/130739664/3891198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488555/normal_6010114e31678.pdfIn PDF document text
    • https://kaxitojuwomig.weebly.com/uploads/1/3/5/3/135302818/sefenatozuved_pulipa_dulixixili_bogulivusezebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453328/normal_60466f6512877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_60489daac3649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_6029de01ebde1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_604fbd77de1cd.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/voxazedisula/52897035273.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/toperixitali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41eb25aa-2c0a-47ab-91f6-6cb218bbcfee/how_do_spell_slots_work_with_multiclassing_warlock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a2db62-132f-4686-878f-f097b27f7eb4/31393647664.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/how_to_thread_the_handy_stitch_needle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77584c53-e87a-48c4-95a6-98f6d02abd82/sixafepikelariliwuwadef.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/presto_cool_daddy_fryer_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/instagram_template_design_psd.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 5316 bytes
SHA-256: 0e3bbecba4edf1aebd01082e0508170303c5b5ab76585096ddfadff326b91a3e
font_01_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 11068 bytes
SHA-256: 39d8dd3d4e29000db552332a1879864efc1335a4c079b255194953a9d17eab98

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