Malicious PDF — malware analysis report

Static analysis result for SHA-256 063d1c537ef3ec21…

MALICIOUS

PDF

89.9 KB Created: 2021-06-06 03:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 908d446e91746d5cc7eaaa72ffe505a3 SHA-1: 87605633a1c3476e5fc12596c20befad797df9db SHA-256: 063d1c537ef3ec21e3968bcf2b90c5b107938cfc5967577d511b13ac7a952623
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristics indicate it functions as a link farm on disposable hosting, directing users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of external URIs points to an attempt to redirect the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/pbw?utm_term=how+to+pair+rogers+ignite+remote+with+box
    • https://cdn-cms.f-static.net/uploads/4407795/normal_5fd796b1819d2.pdf
    • https://static.s123-cdn-static.com/uploads/4403938/normal_6005ca918ccf0.pdf
    • https://kusuvafivubiret.weebly.com/uploads/1/3/4/8/134888197/mozase.pdf
    • https://cdn-cms.f-static.net/uploads/4414678/normal_6041513baa05d.pdf
    • https://static.s123-cdn-static.com/uploads/4386609/normal_5fcdae087117e.pdf
    • https://lapenemelibi.weebly.com/uploads/1/3/4/7/134708636/629bc61656fe.pdf
    • https://cdn-cms.f-static.net/uploads/4497646/normal_5fd60e04eb0fa.pdf
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd5f9ee44567.pdf
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5ffb82a9787a3.pdf
    • https://cdn-cms.f-static.net/uploads/4495854/normal_5fe92ad436811.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wusagem.pbworks.com/w/file/fetch/144447426/26020802426.pdf
    • http://podixarutib.pbworks.com/f/detilikefaba.pdf
    • http://giwupiraride.pbworks.com/f/first_20_elements_of_the_periodic_table_with_atomic_number_and_mass.pdf
    • http://vedufid.pbworks.com/w/file/fetch/144603318/driving_theory_test_practice_2019.pdf
    • http://zuvuzut.pbworks.com/f/derovokufifasefon.pdf
    • http://fatakalewene.pbworks.com/w/file/fetch/144522093/35811294364.pdf
    • http://xozojonurom.pbworks.com/w/file/fetch/144536259/fuwilapidaxaguga.pdf
    • http://vazesuna.pbworks.com/f/88612753411.pdf
    • http://wuxikadafi.pbworks.com/w/file/fetch/144621735/kudolud.pdf
    • http://wepoline.pbworks.com/w/file/fetch/144695403/xovesibetuneviro.pdf
    • http://sisagexal.pbworks.com/f/tusibun.pdf
    • http://beratirupo.pbworks.com/f/nixegizu.pdf
    • http://godekazonigi.pbworks.com/w/file/fetch/144478599/36434544872.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d98.bin
160810561b28cd334c267c5da2944ef6909cbaabc762d1e273b7f1cf164d9c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 3288 bytes
font_01_sfnt_off0001195b.bin
c16e2272be0d926588d36369cee707fb4b9ea918a6b3fd4d1fb57fcf6274bc46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1195B 5464 bytes
font_02_sfnt_off00012bd5.bin
1f08c0e2ed7d8790879abb23710c003edddb76c68e01ba999f63d1daaeedbc71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 13492 bytes

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