Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc7b9aefba28a84…

MALICIOUS

PDF

79.8 KB Created: 2021-03-16 09:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4320b635123a4f0caba6b752ec18ae02 SHA-1: ee3c2c9c5b5afbb86a4d5e26a788aabbaa58f627 SHA-256: 8dc7b9aefba28a842e8fdfd26aed3b4e87e9beba70c1586d47e509be5dbf521e
96 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 an embedded URI pointing to 'https://zajinet.ru/strik?utm_term=pena+de+muerte+en+puerto+rico+1927', which is likely a phishing lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://zajinet.ru/strik?utm_term=pena+de+muerte+en+puerto+rico+1927
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/06d7e8.pdf
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/8bf0ca0.pdf
    • https://cdn-cms.f-static.net/uploads/4418556/normal_6042c41ae9747.pdf
    • http://dusipoweg.mywebcommunity.org/who_is_the_last_prophet_in_the_new_testament.pdf
    • https://cdn.sqhk.co/nezazexador/jbjbh93/41456718360.pdf
    • https://cdn-cms.f-static.net/uploads/4481999/normal_600e69ea1fbd1.pdf
    • http://baltika-trans.com/amortization_and_sinking_fundseynu0.pdf
    • https://cdn.sqhk.co/zojixemem/NMZjjjj/icy_hot_cream_vs_patch.pdf
    • https://lokevevivepino.weebly.com/uploads/1/3/4/1/134131736/2ca9fc9a80bb4a.pdf
    • http://wei-nmvc.com/muburufebadupitupiwunpt4y.pdf
    • https://cdn.sqhk.co/zapiseniw/hjViapv/the_girl_in_the_window_walkthrough.pdf
    • https://cdn.sqhk.co/dimusokobab/bjchjic/vurozoxejidevukinakado.pdf
    • https://cdn.sqhk.co/ruxesotovo/iajahf3/tozikud.pdf
    • https://cdn-cms.f-static.net/uploads/4372076/normal_604165f47b762.pdf
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5ff3ab8aa4819.pdf
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/4538da19.pdf
    • http://reduslim-buy.site/is_orange_juice_better_for_you_than_apple_juicej5h3l.pdf
    • http://test123test.xyz/100_civics_questions_and_answers_polish_version9tlkp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xojudemavu.onlinewebshop.net/tekijejamudulizoz.pdf
    • http://xuxalonitu.onlinewebshop.net/lemirevubuwuxu.pdf
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_2b25acdc9416409389012693ffb1b963.pdf?index=true
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_280258f1d77f4ddea3b0efd2474749e9.pdf?index=true
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_afb27a9312d744e5b78a34f719851eec.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6cb.bin
b90a0674936b750380722d1dfd981ee9b8e0b34faf42a0d7e181bf986483d85e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 5432 bytes
font_01_sfnt_off0001093a.bin
e6b8041dad3fb3ae44ed3e68191870f4d89679e69e9aa535db2e2f33e48f85c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 11928 bytes

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