Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ddb559857fcb45…

MALICIOUS

PDF

75.2 KB Created: 2021-02-22 07:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f77d3e1481bde8503843fb60f7f986d8 SHA-1: 9ab961d0218e0e390ff00135285012ad57192eb8 SHA-256: d7ddb559857fcb458c363461e18e09a8edec26fe85f4179ce9cf51fe4c0dc2ef
186 Risk Score

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/123?utm_term=does+walmart+sell+pulse+oximeters+in+store PDF link annotation
    • https://gifolavetufo.weebly.com/uploads/1/3/2/6/132695571/wuranaluvafinuku.pdfIn PDF document text
    • http://magic-world.site/hey_jude_movie_subtitleseo3xi.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/d9qhhig/kugamosikodos.pdfIn PDF document text
    • http://generatorsale.ru/falasadezojikigav3w.pdfIn PDF document text
    • http://0fruit.space/bebiruzateredatajazet9zlb.pdfIn PDF document text
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/d885c995b.pdfIn PDF document text
    • https://relulime.weebly.com/uploads/1/3/4/3/134384492/697eb.pdfIn PDF document text
    • http://pufopiguzelefe.22web.org/5676940802.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/3821969.pdfIn PDF document text
    • https://famepakemujo.weebly.com/uploads/1/3/2/7/132740594/laferuwixewosu-lepopudetak.pdfIn PDF document text
    • http://mysteps.online/fresnel_s_biprisms933k.pdfIn PDF document text
    • http://storezone.info/juwomoqzoix.pdfIn PDF document text
    • https://sekugarotapoze.weebly.com/uploads/1/3/4/3/134362520/3892492.pdfIn PDF document text
    • http://afterdealer.pro/73563064754w2n25.pdfIn PDF document text
    • http://afracheat5.xyz/general_knowledge_questions_for_kids134c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fifomivosa.rf.gd/online_karyotype_activity_worksheet_answers.pdfIn PDF document text
    • http://waxobutadarase.rf.gd/tagalog_bible_free_for_mac.pdfIn PDF document text
    • http://puzexexaniledow.epizy.com/48459051553.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_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 5124 bytes
SHA-256: 0866c5b56dfc35ad7665ae4e7d9c496fc83c12385b17786677806a513a58cc3d
font_01_sfnt_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 11208 bytes
SHA-256: b1614b366e057e80748438fe357ec6326a0ac8b7449d19c8fa4a202425d8cbbb

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