Malicious PDF — malware analysis report

Static analysis result for SHA-256 8443270ef63920c7…

MALICIOUS

PDF

72.0 KB Created: 2021-06-13 19:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa140a9af079383f9c5db9e7968a5db1 SHA-1: dd44862f6b232cb8c28964aa7138d68f8d54f66f SHA-256: 8443270ef63920c7cef5dc89d9b5bad49430fed501e33f71cfd8d01fc11c71dc
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The sample is identified as malicious by ML classifiers and ClamAV. It contains heuristics indicating it's a link farm and uses a clipboard command lure, instructing users to paste content into a shell. This suggests an attempt to execute arbitrary commands, likely for downloading and running a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://archism.ru/pbw?utm_term=list+of+dos+commands+pdf
    • https://cdn-cms.f-static.net/uploads/4459324/normal_600e5a11912c2.pdf
    • https://jopegivev.weebly.com/uploads/1/3/4/2/134234712/aba87049adba.pdf
    • https://sotamepepoj.weebly.com/uploads/1/3/0/8/130874386/dajusotinodenulomil.pdf
    • https://static.s123-cdn-static.com/uploads/4454289/normal_5ff6068092804.pdf
    • https://cdn-cms.f-static.net/uploads/4468812/normal_5fe9550f47efc.pdf
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5fdc059b1ac2f.pdf
    • https://jisuxewaxem.weebly.com/uploads/1/3/1/8/131857679/9055602.pdf
    • https://static.s123-cdn-static-d.com/uploads/4500425/normal_60b62eeaefd4a.pdf
    • https://cdn-cms.f-static.net/uploads/4425737/normal_5fd0de2686d35.pdf
    • https://pigegiwoxare.weebly.com/uploads/1/3/5/3/135385020/1904504.pdf
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/739335.pdf
    • https://static.s123-cdn-static.com/uploads/4393485/normal_5ff8a30dcef46.pdf
    • https://xiwiriled.weebly.com/uploads/1/3/4/8/134899872/5541512.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gezebal.pbworks.com/w/file/fetch/144805731/how_to_use_a_slime_kit.pdf
    • http://kiwazotomija.pbworks.com/w/file/fetch/144647757/what_is_the_principle_of_triple_sugar_iron_tsi.pdf
    • https://uploads.strikinglycdn.com/files/6867e439-6dec-463b-a29c-1eb499bdf630/great_love_story_book_series.pdf
    • https://uploads.strikinglycdn.com/files/01d2f37d-f06f-4241-afe2-7165cc643c44/kulukeweretikaxukogaka.pdf
    • http://jebusolole.pbworks.com/f/nebonixusapiwofalux.pdf
    • http://wepoline.pbworks.com/w/file/fetch/144475326/ate_ve_su_2_indir_yandex.pdf
    • https://uploads.strikinglycdn.com/files/a6a51a27-c753-40b1-858c-0e8ea1dc0633/69422129919.pdf
    • https://uploads.strikinglycdn.com/files/517caaec-d84c-4a77-ae8e-5b8dc810edf1/trig_identities_worksheet_grade_11.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_off0000dccc.bin
5bc6239ab116fc2073e5f92d99c9035b070725fc9380838bc5e125cebab8923e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 5112 bytes
font_01_sfnt_off0000ee2a.bin
78b011292d9afccf7d49647685bbd3e2a46fc752a1140c2d6d8696dc870f058d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 10852 bytes

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