Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b08b7071f85e2f…

MALICIOUS

PDF

73.0 KB Created: 2021-06-11 11:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 70cdad592849337b558b8276e9ba8c68 SHA-1: 3f189cf122cb2bb030f40b6558addff35a0480d0 SHA-256: 09b08b7071f85e2f9e62c1638b112fbf7b3475f8dc9a36b4f5e69469585985da
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 one prominent URL pointing to 'infrive.ru' and another to a Weebly subdomain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains text suggesting it is an accountancy PDF, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/pbw?utm_term=class+12+accountancy+pdf PDF link annotation
    • https://mefomenixa.weebly.com/uploads/1/3/4/2/134235772/5964351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_60411ffb144fc.pdfIn PDF document text
    • https://putusura.weebly.com/uploads/1/3/1/6/131606782/37ac10e7c6d7cd3.pdfIn PDF document text
    • https://jopokoguse.weebly.com/uploads/1/3/0/8/130874396/d0ea8db8f.pdfIn PDF document text
    • https://puzagoliwosur.weebly.com/uploads/1/3/4/4/134462366/f504589e7708658.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4503525/normal_60b5c0c41237e.pdfIn PDF document text
    • https://xirofagoxo.weebly.com/uploads/1/3/4/5/134576207/3503652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_60be7f1b9a0b5.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/bafufejefebutoj-jolewarip-gezuwebavojem.pdfIn PDF document text
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/lixarev.pdfIn PDF document text
    • https://labatozun.weebly.com/uploads/1/3/1/6/131607827/nuxaxegiwunujoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_603042ff386d8.pdfIn PDF document text
    • https://popugimamad.weebly.com/uploads/1/3/0/7/130775647/pakuboso_luperewobomiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d31a6a84-f536-4a6b-88fc-4234edaebb72/matoboxol.pdfIn PDF document text
    • http://rajejor.pbworks.com/w/file/fetch/145032732/brawl_stars_private_rebrawl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d27f653a-5b00-440b-ae06-bf803a97d6e5/best_alkaline_food_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2e965f-8823-4f53-aaeb-9bf63f359650/28936519291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d55a512-2081-4442-b4ed-09f90150f36e/theories_of_social_entrepreneurship_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6447ddc4-cf14-4137-ad78-d49fe3f8ffa0/present_continuous_online_games_british_council.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ebf02f-7eae-4834-b5e6-bd0f236e204b/vonan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4250a60-76a2-4415-861c-b6d45f60b005/55560932073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16000e6-4e1c-49f1-bc72-4831110d2bef/67721985795.pdfIn PDF document text
    • http://nutafojijoki.pbworks.com/f/how_long_does_athletes_foot_stay_on_surfaces.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144824349/how_to_put_ringback_tone_on_android.pdfIn PDF document text
    • http://zegakodas.pbworks.com/w/file/fetch/144800982/wegutevulemadazepufe.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_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 5244 bytes
SHA-256: 6e7eed7efb9ec2d478824e7bf190d1c2fe19ac4d07fa2d7f608be60382cd98f1
font_01_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 10440 bytes
SHA-256: f1b28e719082747abdf933e18209bbaedd349c5784e03c0a832f1b56a215be34

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