Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe7127c8b7295b0…

MALICIOUS

PDF

78.5 KB Created: 2021-04-02 06:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b8875b0da92abdffc3da13f019ab56d1 SHA-1: 9d5e9d6b61e4208bd28d5911e57b3eeb4fc457e1 SHA-256: dbe7127c8b7295b055d052101761f748a3d4e9b1b0c28a219fb62218940d4cc5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to 'maypoin.ru' and a query string suggesting a search for refrigerator reset instructions. Heuristics indicate this PDF is part of a link farm on disposable hosting, and a machine learning classifier and ClamAV both flagged it as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=how+do+i+reset+my+samsung+twin+cooling+refrigerator PDF link annotation
    • http://lowufadit.scienceontheweb.net/jusudu.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/how_many_captain_underpants_books_are_there_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387052/normal_5fc644f0d811a.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/cat_in_the_hat_characters_boy.pdfIn PDF document text
    • http://gavokofubafixi.getenjoyment.net/tidevopemu.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/zelda_ocarina_of_time_official_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_5fea241097be4.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/hRhg1ge/xililixamusotikejugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_6047e15957803.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/a7hj80J/75219975077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505687/normal_5fd0d8746e226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503874/normal_5ffd66580ef81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455196/normal_5ff8b23fc5365.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/ljaB8gd/jitijenegoder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_60341ae8cf268.pdfIn PDF document text
    • https://cdn.sqhk.co/menekilebuz/dIhi9wp/wagegarisit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fajenadiwizowo.atwebpages.com/adrenal_gland_tumors.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/zazujowusal.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_90c8e998dfba4c6884caac18e3ad998e.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_d1f9cc43355c45ffaa3b78384232722d.pdf?index=trueIn 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_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 5496 bytes
SHA-256: 4f4e6057b5539145f7d7adc82272a09e14ce3002d70b661720611d549215be89
font_01_sfnt_off00010437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 11356 bytes
SHA-256: b074cc924fa09d917f055f856327c52ce6c23bcc7fe1353848b18b3269347f37

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