Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f9f041f3beba85…

MALICIOUS

PDF

66.0 KB Created: 2021-02-15 13:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2a853d0377af969796a53440dcb4c1b5 SHA-1: 2923233a5c74cd8549194f5ac70f4f57fc42e4ae SHA-256: 25f9f041f3beba857fe6184057b64cbc3caddd5659ae7a8068995ba8f4bf9c8b
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 embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to research proposals, indicating a lure to entice users to click on the malicious links.

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://jottigo.ru/strik?utm_term=research+proposal+sample+computer+science PDF link annotation
    • https://cdn.sqhk.co/mewuwemiromi/5g7LLij/serial_bluetooth_terminal_raspberry_pi.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/aKhj6ji/forbidden_lands_dice_roller.pdfIn PDF document text
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/4092071.pdfIn PDF document text
    • http://twoup-viktoria.online/410383258979t39k.pdfIn PDF document text
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/9527657.pdfIn PDF document text
    • https://latezuletarok.weebly.com/uploads/1/3/5/2/135298634/3217386.pdfIn PDF document text
    • https://cdn.sqhk.co/gidewura/mgfjhkT/galujojez.pdfIn PDF document text
    • https://vebuwume.weebly.com/uploads/1/3/5/3/135349689/fixafoxokuwixo-natugiwazesab.pdfIn PDF document text
    • https://pusexijubod.weebly.com/uploads/1/3/5/2/135296384/7308802.pdfIn PDF document text
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/81d64a8df2c4.pdfIn PDF document text
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/gofugijojus-nesimijajilaf-wewefenenif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puxakuxuvon.epizy.com/rebawileraxuzitoj.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/xenobiotic_transport_and_biotransformation_reactions.pdfIn PDF document text
    • http://xokopaxitake.rf.gd/6550684598.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/oxford_advanced_learner_s_dictionary_apk_obb.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_off0000c7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A5 5180 bytes
SHA-256: 31e5372c86a40d21372e6d84418200ec24e3ec0a7c018fd8f6b13b41ffd966ff
font_01_sfnt_off0000d920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD920 9848 bytes
SHA-256: 0b2a151699b665d39228b1b3e223dc7e8bc012641e6ff47c63c684004691ca2f

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