Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c32d94ea71871d…

MALICIOUS

PDF

77.6 KB Created: 2021-04-12 00:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bba07b11c9fd3214a420a170db1b9c75 SHA-1: 1083bd0abfe333a93547b34371ef300c4693ba54 SHA-256: 42c32d94ea71871d689aa88360e0f259552c77da55e2d18f6ee2b698c400232a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/strik?utm_term=how+to+read+an+upper+arm+blood+pressure+monitor PDF link annotation
    • https://sobopagep.weebly.com/uploads/1/3/0/8/130873740/4926361.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/94646997699.pdfIn PDF document text
    • http://varuvoruva.iblogger.org/3404365928.pdfIn PDF document text
    • http://kedusigodozop.22web.org/zekaluxitamiwudive.pdfIn PDF document text
    • https://novifofogabux.weebly.com/uploads/1/3/4/3/134371065/sunasipixujogu_lefigabosiz.pdfIn PDF document text
    • http://bazezirovif.iblogger.org/bronkitis_adalah.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/putesipiravijapejifeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nomupig.rf.gd/deficiency_of_water_soluble_vitamins.pdfIn PDF document text
    • http://tikijot.epizy.com/65971484478.pdfIn PDF document text
    • http://xoremuzora.rf.gd/buzzword_game_cards.pdfIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_78f109812c384070b571ab951f7dfe89.pdf?index=trueIn PDF document text
    • http://womipir.rf.gd/47318610084.pdfIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_4a87de14ca3a45e99f771ddfafc908fb.pdf?index=trueIn PDF document text
    • http://bodonezasajig.rf.gd/27590210306.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_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 5296 bytes
SHA-256: aafaac52ec5d6ec13247a148dc9b4b635869f4fd910e36587aee5e47afac5c14
font_01_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 10840 bytes
SHA-256: 99d292be7b18dff4e7504d912ec4ec812b1101de566752a8f5398997dc7c630d