Malicious PDF — malware analysis report

Static analysis result for SHA-256 364328f3d1a7f184…

MALICIOUS

PDF

84.3 KB Created: 2021-05-01 14:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8aab2f352bbe6b2ca8169194cc1e0208 SHA-1: 31f8f54a7a2bd626c7afc24355e0899d11a958ff SHA-256: 364328f3d1a7f184f219c48d1e0eb1e6348df1606187b0275a53dc7eced5ec39
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL being https://baarspo.ru/strik?utm_term=what+does+buying+a+call+option+mean. The document body, though heavily obfuscated, suggests a lure related to financial topics, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=what+does+buying+a+call+option+mean
    • http://tunewejewuz.mypressonline.com/bsc4success_computer.pdf
    • http://kofojoxake.mygamesonline.org/zobebixatebupajifetiwe.pdf
    • https://static.s123-cdn-static.com/uploads/4388048/normal_5fec8f088c515.pdf
    • https://cdn-cms.f-static.net/uploads/4488556/normal_5fda283de2070.pdf
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5ffd02ee15362.pdf
    • http://xelamoxadavas.mywebcommunity.org/vesademidixemefu.pdf
    • https://cdn-cms.f-static.net/uploads/4412761/normal_602f2ab1af7a3.pdf
    • http://veselutut.mywebcommunity.org/59893814075.pdf
    • https://cdn-cms.f-static.net/uploads/4459182/normal_603b01b3e4a48.pdf
    • http://mobeditobaxul.scienceontheweb.net/2020_starcraft_mossy_oak_ultra_lite_311bh.pdf
    • http://davupopebuwiser.sportsontheweb.net/rsistance_aux_aminosides.pdf
    • https://cdn-cms.f-static.net/uploads/4412415/normal_6036c8fff1b0c.pdf
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/116077.pdf
    • http://vowujebotoza.mywebcommunity.org/89285517011.pdf
    • https://cdn-cms.f-static.net/uploads/4444104/normal_603ded42cba6c.pdf
    • https://vusiwofadenu.weebly.com/uploads/1/3/4/2/134265349/zinipafa_suvazesijokupot_xonulijasi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wazeniwemir.onlinewebshop.net/clinical_examination_of_respiratory_system.pdf
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_15bad6fc7652434ebc00bfb034114c96.pdf?index=true
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_2810892030f147099d736c514a802a7b.pdf?index=true
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_4364d194f2894e11b6f208a6602d9f4a.pdf?index=true
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_4f00dc2689a14fce977073af79a638c6.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_off000109ae.bin
b78a4371afcacbc45778e1c43c93c5731408825b6c1bd9540e2b2b0ef4dbe793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 5644 bytes
font_01_sfnt_off00011cd5.bin
71542ddb8ab78bb5f81a22212f7131614cb2581d02326498f770bba0e63b20be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 11260 bytes

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