Malicious PDF — malware analysis report

Static analysis result for SHA-256 acab13f745007860…

MALICIOUS

PDF

106.1 KB Created: 2021-02-26 19:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 95db8df23171e7e76e5719acd7549e11 SHA-1: 6d32d1d20783dd93b71e34f14afc0dc174dfb982 SHA-256: acab13f745007860ae47bb6655040ea18853629d8fee0ad9968ed71d13b1b26c
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to periodic table elements and wkhtmltopdf, which is unusual and may be a lure.

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://midufefew.ru/wb?keyword=cuantos%20elementos%20de%20la%20tabla%20periodica%20son%20gaseosos%20a%2020%C2%B0c PDF link annotation
    • http://roxelejabojafe.scienceontheweb.net/marvel_schebler_carburetor_tsx_34.pdfIn PDF document text
    • http://misudijawalezom.22web.org/69574646825.pdfIn PDF document text
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/sofisezofobanij.pdfIn PDF document text
    • https://wijununag.weebly.com/uploads/1/3/1/4/131438003/zikidudowenujafomuk.pdfIn PDF document text
    • http://luzibis.iblogger.org/what_does_the_nightingale_bird_symbolize.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/tipping_point_definition_geography.pdfIn PDF document text
    • http://bathforlegs.xyz/calendar_format_in_excel_20179psw6.pdfIn PDF document text
    • http://nesobaka9.xyz/78707726499trags.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/risalenefazozo/badmaash_company_full_movie.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/wapiwurademolozewimenimi.pdfIn PDF document text
    • http://merapuw.epizy.com/axially_symmetric_deformed_nuclei.pdfIn PDF document text
    • http://pabizazixivak.epizy.com/12513123824.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_off00015367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15367 5832 bytes
SHA-256: f5e250bbf5e293fc437fa550333455b5442eeee85399915d4a9e13707bdaa12e
font_01_sfnt_off00016723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16723 15820 bytes
SHA-256: 1032e824f06c02ffc3105ca2ece21e04bfd9acdd92a2e9597d6893d498c5b543

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