Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f304ac8dc705f84…

MALICIOUS

PDF

75.8 KB Created: 2021-02-12 20:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b07f7572bfb889d69e647da4bbb30d55 SHA-1: 457ae0f4b31252f14a01b7ac6db90e540e4c0138 SHA-256: 1f304ac8dc705f842cd6d29a5f71ff398a9eb343f0c4225e2e43b38396bcbb89
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to a suspicious domain ('seumenha.ru') that is likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to 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://seumenha.ru/123?utm_term=hudson+river+school+of+art+apush PDF link annotation
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/be2643.pdfIn PDF document text
    • http://lanufutado.22web.org/bitdefender_total_security_2019_software.pdfIn PDF document text
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/295c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_6023d7dee92d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499317/normal_5ff1dfbe53530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fe519c2bf1d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485718/normal_5fcdfbdfc8f39.pdfIn PDF document text
    • https://kurinasuvofete.weebly.com/uploads/1/3/5/3/135334761/bimadepilevep_rizumidavikexo_jotadamebosume_tiziri.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/5338588.pdfIn PDF document text
    • https://leluwimatuw.weebly.com/uploads/1/3/0/9/130969986/pokuzi_najafa_tibeselopet_livudojakax.pdfIn PDF document text
    • http://menajaf.iblogger.org/internet_speed_test.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/97ff257f7.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/dekogamik/kegoxujenijuji.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/word_cookies_cheat_answers.pdfIn PDF document text
    • http://resogugibu.rf.gd/justiciar_inferno_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/bazovuduxusopu.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/73020447278.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_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 5264 bytes
SHA-256: a551074af84571e274a70f0918cdd66f60f14a9b6d381c7ae3c095b21eaccb99
font_01_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 10704 bytes
SHA-256: 21f2abf737266766b89f86c37060ac8319748fce4f1d505478f33afb50c8c8bd

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