Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f937413119f3bb…

MALICIOUS

PDF

86.2 KB Created: 2021-04-03 19:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22f0c42f1772017843bcec5784428a99 SHA-1: 15fe270b6dc6a17e604eff30cdbd3105c84ad281 SHA-256: d6f937413119f3bbe2d57ecbfdbd41d5557de6defe96dc4504bde8026e77d0e8
156 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 links, many pointing to Weebly and other domains, suggesting it's part of a link farm or phishing campaign designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains metadata related to IELTS preparation, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=ielts+general+training+writing+task+1+tips+pdf
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/235b983d1a52efe.pdf
    • http://dokakepitizix.medianewsonline.com/bodyweight_workout_schedule.pdf
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/9705144.pdf
    • http://cg-designer.xyz/wapepatekokr0yq.pdf
    • https://wizisenax.weebly.com/uploads/1/3/4/3/134320615/sogizananagetopemob.pdf
    • http://burrrhey.tech/3824520871pdh1d.pdf
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/sujeb.pdf
    • https://lafasisagugugup.weebly.com/uploads/1/3/1/6/131637889/ef7cd014.pdf
    • https://mujonutuxow.weebly.com/uploads/1/3/4/3/134336111/mutabeketaj.pdf
    • https://puganijososas.weebly.com/uploads/1/3/1/8/131871778/fidujonumigax.pdf
    • https://voxaxaloxedifuz.weebly.com/uploads/1/3/5/3/135399296/zajekepomewa.pdf
    • http://siankaanmexico.com/begofudizusajosonu0ktlk.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lodumojokexiku.onlinewebshop.net/leferekepumulelefej.pdf
    • http://zugepoguj.onlinewebshop.net/name_list_of_boy_in_hindu.pdf
    • https://s3.amazonaws.com/pomaxa/potokopumiratotu.pdf
    • https://s3.amazonaws.com/tobaziw/afmc_entrance_exam_question_papers_free.pdf
    • https://s3.amazonaws.com/jedobufudajewu/french_dictionary_free_for_pc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103d8.bin
a8ac25188a1eebcf5856276953227e71e82d23927bf6d9a8eb32b59e78e15123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 5032 bytes
font_01_sfnt_off00011513.bin
b82a064c5d696e130fabc341a5523b6689ab4308ca83c9c9db8521169cd25499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 11080 bytes
font_02_sfnt_off00013af7.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF7 4324 bytes

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