Malicious PDF — malware analysis report

Static analysis result for SHA-256 952fc0aa4c14a63e…

MALICIOUS

PDF

73.1 KB Created: 2021-02-07 17:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 809f766ce171004d9810212e730591a2 SHA-1: 1cf66334e5e01c5a200da7d466d3e95fda6de3d6 SHA-256: 952fc0aa4c14a63e15b51fa8f6a5ab7494563c01a38c71f622f5efa52a0ba67a
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 external URIs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

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://jacksth.ru/wb?keyword=voxengo%20pha%20979%20free PDF link annotation
    • https://cdn.sqhk.co/jiluputumusi/7JxO14r/chatham_kent_emergency_department.pdfIn PDF document text
    • http://zabavnyi-slon.ru/instrumental_quirurgico_clasificacionkg88k.pdfIn PDF document text
    • http://moneyindia.site/divinity_original_sin_multiplayer_4_playerdpcws.pdfIn PDF document text
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/vadokugodozumu.pdfIn PDF document text
    • http://kavoxujeledi.iblogger.org/blackberry_z10_messenger_apk.pdfIn PDF document text
    • http://xeeewq.xyz/emsisoft_anti_malware_portable_freel938n.pdfIn PDF document text
    • http://9gusevshop.space/clash_of_clans_private_server_hack_iosthkb5.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/934800.pdfIn PDF document text
    • https://cdn.sqhk.co/xogiwusumo/hfihYbn/99602378653.pdfIn PDF document text
    • https://cdn.sqhk.co/jidobimatu/njcgfs0/non_emergency_police_chatham_kent.pdfIn PDF document text
    • http://smartcreditscore.info/2016_calendar_template_australia_word3x88a.pdfIn PDF document text
    • http://custits.space/information_systems_interview_questions_and_answersd1y72.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/ejhhaie/64135691931.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/dazifozixawus/cinema_4d_r20_anleitung_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/business_card_template_free_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/16735901877.pdfIn PDF document text
    • http://mowubuzedolilaf.epizy.com/47640060262.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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 5220 bytes
SHA-256: 1d2122eef75f3fc8c6bd272ee52cf4bd7da51367cf3ca702121b4c8a744877cc
font_01_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 10484 bytes
SHA-256: 8cedf6edd6e2d26065f618c7e2bd2235dfefa347d697d130d443c21609008331

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