Malicious PDF — malware analysis report

Static analysis result for SHA-256 141cd4872253a5bb…

MALICIOUS

PDF

83.1 KB Created: 2021-05-12 13:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d08ed7fdce78743f99bbd68245de642f SHA-1: ea9b653be200e91958ed705870816ac27b16a01d SHA-256: 141cd4872253a5bbc248f82efe806c52326fe60b5a763c727c33e02971d26c3b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO spamming technique. One of the primary URLs, 'https://lozipotod.ru/strik?utm_term=what+is+bbg+program+for+weight+loss', appears to be a lure for phishing or a scam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/strik?utm_term=what+is+bbg+program+for+weight+loss
    • https://cdn-cms.f-static.net/uploads/4490735/normal_601a9a759af69.pdf
    • https://cdn-cms.f-static.net/uploads/4466659/normal_6049c6ec380f0.pdf
    • https://static.s123-cdn-static.com/uploads/4469128/normal_5ff5ca7c1e847.pdf
    • http://vuvuga.xyz/fiwovu440pe.pdf
    • http://amsidisi.xyz/english_learning_games_for_students7wrxa.pdf
    • https://cdn-cms.f-static.net/uploads/4481424/normal_6065e3f5a21ac.pdf
    • http://natnat.fun/what_books_outsold_agatha_christient1yl.pdf
    • http://pedrons.space/panasonic_kx-dt343_specifications1uo8d.pdf
    • http://usblighter24.site/pearls_of_wisdom_for_new_parents143np.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_fd4ca93a125d4edbb59a229c690654af.pdf?index=true
    • https://s3.amazonaws.com/mipeboro/bunny_live_apk.pdf
    • https://s3.amazonaws.com/sowewazulejewi/titudogulidepur.pdf
    • https://uploads.strikinglycdn.com/files/12f56cda-9cf4-4c19-93d5-0e65f525ea45/call_of_cthulhu_d20_portugues.pdf
    • https://s3.amazonaws.com/nodetuxapabara/55962250755.pdf
    • https://s3.amazonaws.com/vebenok/35636476624.pdf
    • https://uploads.strikinglycdn.com/files/4df0146b-b8fb-482d-a2ed-e827eab52115/how_to_change_default_username_in_kali_linux.pdf
    • https://s3.amazonaws.com/furunumaroxun/4562810739.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_8a72c619049841af9d9a626896552cd1.pdf?index=true
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_605f66294936416499d2a0f2706a6df6.pdf?index=true
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_4166b3d40d41421488a2e3c8724b7821.pdf?index=true
    • https://s3.amazonaws.com/daraniwekamidir/apprendre_l_arabe_en_10_leons.pdf
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_931be57635e14a539bce6037593be0e8.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_off0001081a.bin
493d1fbe47f2c890ae5c77adac0628e175a0a69984be05b246feaddf56324482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 5560 bytes
font_01_sfnt_off00011af3.bin
94a573c1d011dc2b4a1d8b0c8f231e0dff3f64678fa0b0122b2bce07ab9e4822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 10828 bytes

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