Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f9220b4c8c47ce…

MALICIOUS

PDF

75.8 KB Created: 2021-02-23 21:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6fa0080144f1d3100ff488d81976a6ba SHA-1: 7e79f0d4b3708dbe6b32cc10414e0845de27d706 SHA-256: c6f9220b4c8c47ce1271fbc242faa919cba34608e624ad589309762bbbaa8b77
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=how+to+set+time+on+armitron+wr330ft PDF link annotation
    • https://cdn.sqhk.co/tajugajobib/gwhiLjb/water_park_charlotte_nc.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/7353574.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376354/normal_60063c1eb7ae1.pdfIn PDF document text
    • https://cdn.sqhk.co/tibapopedeka/OIifja1/descargar_pocket_chibi_anime_dress_up.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/ihDidia/callaway_golf_apparel_near_me.pdfIn PDF document text
    • http://bepevekebezupu.22web.org/dell_xps_8300_manual.pdfIn PDF document text
    • http://josamaduxano.22web.org/are_cat_and_dog_worming_tablets_the_same.pdfIn PDF document text
    • https://jasugigikimodo.weebly.com/uploads/1/3/1/3/131383258/sowanuka-vazixipaj.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/9iagh7g/80043577899.pdfIn PDF document text
    • https://zebazefapik.weebly.com/uploads/1/3/1/3/131383848/difusiz_liluraborovota.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/hiSjdOa/speedway_challenge_2020_liga_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405644/normal_6006c8b5dd47b.pdfIn PDF document text
    • https://jurikinala.weebly.com/uploads/1/3/1/6/131636618/11138.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/daxemo/free_employment_agreement_template_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/ave_maria_original_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/tenancy_reference_letter_template_uk.pdfIn PDF document text
    • http://mopezit.epizy.com/naledovawutadipinejowe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 5028 bytes
SHA-256: 5eedc535ba41a2f0c2a204e63d4238f3e504ad2d0408eff697cc4d564c9f8d58
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 10240 bytes
SHA-256: 78227a4d660870c078d414baa18a65108c6632e5185bec05e73edfb6b7f6f77a
font_02_sfnt_off000113f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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