Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91a429e75cba1ff…

MALICIOUS

PDF

80.6 KB Created: 2021-03-10 07:23:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a50827cae5201d1fc5bd39276ea47c7 SHA-1: 1af4e07da2f384c242f83e1e2786ca1c4fb90bf7 SHA-256: b91a429e75cba1ffebbe6c75f4496c63e14876ae1258830be49dbdf188dacb36
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/award?keyword=awk+command+unix+examples+pdf', which is likely a phishing lure disguised as a search result. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=awk+command+unix+examples+pdf
    • http://sks-expertiza.ru/bible_verses_for_youth9616c.pdf
    • http://korsabarca.com/jofawumetawopno95t.pdf
    • https://cdn-cms.f-static.net/uploads/4378619/normal_601a2c83b1975.pdf
    • http://ruvogodozipabiv.scienceontheweb.net/xibefeg.pdf
    • https://cdn.sqhk.co/ratijojitud/joicjjW/ice_cream_maker_cake_recipes_uk.pdf
    • http://keksik24.ru/neduvekabagababimome8rdio.pdf
    • https://cdn.sqhk.co/nufomewo/fq5hhIl/dead_city_android_game_free_download.pdf
    • http://triple-doska5.club/netarunotibebe90g0.pdf
    • https://static.s123-cdn-static.com/uploads/4417030/normal_5fc85adfa2d25.pdf
    • https://cdn-cms.f-static.net/uploads/4373281/normal_6014b3285f14e.pdf
    • http://fabermanufacture.ru/fufizasijuxugusirufixxyj5.pdf
    • https://static.s123-cdn-static.com/uploads/4421472/normal_5fcf81513e3fd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/af3c61f2-9ef1-4a64-9a1d-62602bbdf586/86517975355.pdf
    • https://uploads.strikinglycdn.com/files/f60b0f87-5c63-4d72-96b7-e9c2db8fed9c/posigidopekulub.pdf
    • https://s3.amazonaws.com/rudelazifizuvo/ancient_greek_etymological_dictionary.pdf
    • http://xarilupinedup.myartsonline.com/mulawidexibata.pdf
    • https://s3.amazonaws.com/sogovekevi/gemini_security_system_battery_replacement.pdf
    • https://s3.amazonaws.com/jifesu/roxadotesin.pdf
    • https://s3.amazonaws.com/regovadeje/ectomorph_workout_routine_and_diet.pdf
    • https://uploads.strikinglycdn.com/files/ca6b432d-1838-428f-9f5d-14a0ad6eaf89/35751082256.pdf
    • https://uploads.strikinglycdn.com/files/8a7fa63a-5f77-4c32-92f5-a6d46c455a40/why_does_windows_powershell_pop_up_on_startup.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb2a.bin
0cfdb17388a29f8322d62208691d6d3ed21f020bbd19a63caf386a7e271501a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 5416 bytes
font_01_sfnt_off00010da4.bin
93397c48bbdb24c7d31a28c099b82595f581df45b2dd8c44e641f4c752f35344
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 12148 bytes