Malicious PDF — malware analysis report

Static analysis result for SHA-256 5299beef4108cd5c…

MALICIOUS

PDF

85.6 KB Created: 2021-03-01 12:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cba8781a3ccdb03e08f13f2bba3e1e44 SHA-1: 7dbaab8a62f73c24d81597380e0fd9b55858bdea SHA-256: 5299beef4108cd5c4a60c0ab7f567e9eeeb6ba50545c5db74e0804dc3b4f630c
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, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm on disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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://ponafet.ru/123?utm_term=sister+outsider+audre+lorde PDF link annotation
    • https://cdn.sqhk.co/jujirepak/iighdhe/lamovejibudoximitujodut.pdfIn PDF document text
    • https://cdn.sqhk.co/nakokixega/ijct3ib/femuseborodezovake.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/start_sentence_with_day_of_the_week.pdfIn PDF document text
    • http://risitolamaxil.22web.org/funekedizafutab.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/the_night_manager_netflix_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/TlNO5hi/xojij.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/manonoruzax.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/41798450642.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://futikuzita.onlinewebshop.net/40_rules_of_love.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/nixixedap.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/ratilowuxuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/44680986503.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_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 4920 bytes
SHA-256: 18a855bbaaaf7b4a1952860c4d03d7898bd71d0561165651882c8ac6797a90dd
font_01_sfnt_off00012601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12601 10544 bytes
SHA-256: e92f28a78a7599a835ef389f45173e6128ac0a402dbbc5db83109cc3cb0debed

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