Malicious PDF — malware analysis report

Static analysis result for SHA-256 d903169bbbd5c406…

MALICIOUS

PDF

73.9 KB Created: 2021-02-22 07:04:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d2050920dc5a66987a648cdf56f33422 SHA-1: f0761d0a79e9507d2064f547bd9c2c8507d39bb6 SHA-256: d903169bbbd5c4061f4301ee3b2f8127c31003a98ed33880570ab3d703ecd23a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though partially corrupted, suggests a lure related to pregnancy, which is then linked to a URL on a disposable domain. The presence of numerous external URIs, many pointing to link farms on disposable hosting, further supports a phishing or malware distribution scheme.

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://bologen.ru/strik?utm_term=can+sex+cause+spotting+in+early+pregnancy PDF link annotation
    • http://vosiwikaxipe.22web.org/ace_2005_annotation_guidelines.pdfIn PDF document text
    • https://xijoxipuxob.weebly.com/uploads/1/3/4/7/134704834/lasemoke_subipobegogew.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/7jfgihd/clockify_extension_opera.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/xhaCMhh/95619746723.pdfIn PDF document text
    • http://nerroba.info/how_do_you_say_ti_amo_in_englishpu2o1.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/ff9755b25557922.pdfIn PDF document text
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/ad7115.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wixesazu.epizy.com/symbol_ls2208_add_carriage_return.pdfIn PDF document text
    • http://jeliponotetivek.epizy.com/57896813499.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/lepulamopuripa.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/87075862179.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/pukujevutekozuzabixegijas.pdfIn PDF document text
    • http://pitugozuput.epizy.com/67624849829.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_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 5176 bytes
SHA-256: 5196e2122521366eefa8156063e709a373e8d8296decfaff1a167d336185d3f1
font_01_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 10812 bytes
SHA-256: 60ed1d20fd951303a22a5b197a871729009a108df914e0253c4e3f2177d490c4

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