Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7391637cfb93b7e…

MALICIOUS

PDF

88.7 KB Created: 2021-03-03 05:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a7b67af2b0cb11818f1291ac86bb8d09 SHA-1: 586d05fb6784fec9779a0e560b34f6a311250780 SHA-256: d7391637cfb93b7ed9f8fdac5543164fe4e47cd937479cc38b9edec67b874357
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate an attempt to redirect users to potentially malicious content.

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://xezojetit.ru/wix?keyword=asus+rog+crosshair+vii+hero+overclocking+guide PDF link annotation
    • http://tixesikixux.mygamesonline.org/rojagizajatutilenagasuw.pdfIn PDF document text
    • http://draiwenstore.online/zesinenuzulorasubutortm1uy.pdfIn PDF document text
    • https://zaporori.weebly.com/uploads/1/3/4/1/134131460/ab10703f.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/voramil.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/lujabaxipodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_600ec0be8eae1.pdfIn PDF document text
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/fc9bcc5e.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/bible_trivia_questions_and_answers.pdfIn PDF document text
    • https://xutevuper.weebly.com/uploads/1/3/0/9/130969179/4293633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_6009f7ac53244.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/derwent_watercolour_pencils_officeworksa466i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://momunubaj.epizy.com/free_mental_health_intake_form_template.pdfIn PDF document text
    • http://kasukisoravejug.epizy.com/56139925586.pdfIn PDF document text
    • http://zakivijojinikij.epizy.com/rujaxubexemiximek.pdfIn PDF document text
    • http://buvumitibeve.rf.gd/benilunugijibimibidapal.pdfIn PDF document text
    • http://pobopujobezov.rf.gd/pumusikajomopukovuliv.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/how_to_reset_plantronics_voyager_legend.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_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 5316 bytes
SHA-256: 7fd20ac6dd876b91bb6cd05e94652dd9040dc5001ec58b1ffc1b74379926fe60
font_01_sfnt_off00013138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13138 10716 bytes
SHA-256: c03a4052ea3c75a412b2fb0ed6d2846b3086b91e64fe9bf32f86d11cfb478053

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