Malicious PDF — malware analysis report

Static analysis result for SHA-256 0335a79e408aaf94…

MALICIOUS

PDF

79.5 KB Created: 2021-06-04 06:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 89e7a92da30566284c1410f981d9fd3d SHA-1: f86465aac25a6e3d232661e38c8ae0e7d30b1b96 SHA-256: 0335a79e408aaf94ef9f459110dcb5d404fdf1c591b9478708e965d47c35d4fb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used for phishing or distributing malicious content via external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://cructi.ru/pbw?utm_term=1977+prowler+travel+trailer+owners%2527+manual PDF link annotation
    • https://ladetizor.weebly.com/uploads/1/3/4/7/134731735/fisutovesa.pdfIn PDF document text
    • https://fimibiwuru.weebly.com/uploads/1/3/2/6/132696060/xikovebupebajex_megenajediduto_feluroxab_tesasejafes.pdfIn PDF document text
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/eb3971c451e4ce1.pdfIn PDF document text
    • https://tatefazaseg.weebly.com/uploads/1/3/4/0/134016926/bf7184f6069dab.pdfIn PDF document text
    • https://sofubile.weebly.com/uploads/1/3/4/3/134380394/nujaxulimidora_jowaxifubafel_setotine.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/f1d3236296b07.pdfIn PDF document text
    • https://wujipomazoki.weebly.com/uploads/1/3/1/3/131384492/fajuvufuw_pofavomafuxoguf_tisig_rimojo.pdfIn PDF document text
    • https://jozitosada.weebly.com/uploads/1/3/4/3/134325699/9932846.pdfIn PDF document text
    • https://pezusadoti.weebly.com/uploads/1/3/4/5/134525395/803875989c52.pdfIn PDF document text
    • https://liforofejot.weebly.com/uploads/1/3/4/3/134350560/6f63d6a.pdfIn PDF document text
    • https://lufasewobomitod.weebly.com/uploads/1/3/4/7/134730449/7490473.pdfIn PDF document text
    • https://jiwazumirinupe.weebly.com/uploads/1/3/4/3/134352382/zoxadazitoxuliz.pdfIn PDF document text
    • https://sifameduj.weebly.com/uploads/1/3/4/5/134522790/868509e4ba.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/65fa97e7-cce4-46f3-9ce5-db7cb4941945/91732426936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfdddf7f-e4eb-407e-a795-756dca488f00/learn_python_for_experienced_programmers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f6cc05-940c-428d-9611-8894b0e1d02d/waroridaladov.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/f/what_is_certificate_of_residence_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda295a1-561d-475e-845b-695b8dd2e47d/21223753695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff0a091-92e6-4e00-a12a-cc5a8a0d8be4/2000_chevy_blazer_service_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17fc340c-0ce1-44f8-9526-a508a7cab313/ladies_bulova_watch_band_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08b1cc8-d18f-41e7-856d-90f90169b10d/47775805073.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/42056098039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad29d501-06d3-4822-adb6-b11ccb088bf3/koxiwulosumitidagib.pdfIn PDF document text
    • http://gitefov.pbworks.com/w/file/fetch/144570180/ketogenic_diet_recipes_free.pdfIn PDF document text
    • http://tasonupopam.pbworks.com/f/saxomovafutil.pdfIn PDF document text
    • http://gibudufu.pbworks.com/f/what_does_dilated_by_a_scale_factor_of_2_mean.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_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 5344 bytes
SHA-256: 0f5439ded286fa7011e32f06754be56f07e24c5e8edea6c8d08b1c99c3af85a9
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 10696 bytes
SHA-256: f7e91e7f1a3d9e9f320a9642696c53ecdba969a8ccc121fc2042350d21c2f762

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