Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2240b6760999f28…

MALICIOUS

PDF

71.8 KB Created: 2021-03-04 06:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0da5871310b15e2d7f20e6e418ee76ec SHA-1: cd1edf0bab68adf69448bd542abf54edbca74532 SHA-256: a2240b6760999f2814f9a5ca2afbf7efd5ad8e93d19e00f3625ebbc5acf91a3d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a "convert to paint to pdf" lure. Heuristics indicate this PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious. The embedded URLs likely lead to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://mezovuduw.ru/strik?utm_term=convert+to+paint+to+pdf PDF link annotation
    • http://robertferrell.net/programming_erlang_joe_armstrongf391e.pdfIn PDF document text
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/5420527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406456/normal_5fef9a441c55b.pdfIn PDF document text
    • http://1pokypki.website/41574775017izn10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414156/normal_5fcdd380a2496.pdfIn PDF document text
    • http://tryne.xyz/kuzipemumef87xp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488090/normal_5fe5df0255b87.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/biddeford_heated_blanket_controller_blinking.pdfIn PDF document text
    • http://shop50off.info/formatting_excel_spreadsheet_to_printm4ctg.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/juduk/ielts_writing_task_2_template.pdfIn PDF document text
    • http://sakogabutal.onlinewebshop.net/what_does_the_clock_is_ticking_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/baseus_wireless_charger_user_guide.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_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 4788 bytes
SHA-256: 692f0c72225b9c0167db9e62bb3e658223bec08997aec86b37f1179cf5ff32f3
font_01_sfnt_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 11580 bytes
SHA-256: aee6d5f2ce0ead64a276ca2bd2603e386565261a139b2e5751e7331f0c8f1e6b

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