Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d625e06ec2e3a7…

MALICIOUS

PDF

77.7 KB Created: 2021-02-10 14:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: eaca25fe9e1aff4eb8686f87124d5588 SHA-1: c073915656c88de0ec4d2666c04de9b0ab6c3a01 SHA-256: f6d625e06ec2e3a7b856096b486616ed5a7a5099ff137b7bda4bbc16b7cdc0e3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and creation dates, but no direct user-facing text that would indicate a specific lure.

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/123?utm_term=five+crown+card+game+directions PDF link annotation
    • https://cdn.sqhk.co/letonolomo/yiiiuhd/jumpers_for_goalposts_2_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/c6wFheT/snapchat_icon_meanings_two_pink_hearts.pdfIn PDF document text
    • https://katodelof.weebly.com/uploads/1/3/6/0/136051175/telanizamasemijufebi.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/rhiihgf/little_fox_chinese_app.pdfIn PDF document text
    • https://kodetinerimaguw.weebly.com/uploads/1/3/5/3/135347088/bavezaraz.pdfIn PDF document text
    • http://xijafagupigor.22web.org/21668148940.pdfIn PDF document text
    • http://mumadefiku.iblogger.org/formal_introduction_email_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobewegogiz.rf.gd/83489942163.pdfIn PDF document text
    • http://sezusol.epizy.com/antivirus_for_windows_7_free.pdfIn PDF document text
    • http://nozefemalevarug.rf.gd/40332858206.pdfIn PDF document text
    • http://valebuwevunav.epizy.com/11084766203.pdfIn PDF document text
    • http://nuwisumir.epizy.com/bihar_tet_2011_notification.pdfIn PDF document text
    • http://xumutopefar.rf.gd/33181455997.pdfIn PDF document text
    • http://vadupeti.epizy.com/10306206462.pdfIn PDF document text
    • http://rexivire.epizy.com/kuwojoli.pdfIn PDF document text
    • http://gegenig.epizy.com/6308755351.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_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 5332 bytes
SHA-256: 953e0b3bdff64f1eb880cb20cbbec0a42c0626ba64124ec3245c6fd354c754a6
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 10428 bytes
SHA-256: 99b71abe67619e8f88b9a37b4aecfa94c9a178c23e9722c097568527ae879003

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