Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d6841d23f6e68d…

MALICIOUS

PDF

72.2 KB Created: 2021-03-06 07:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bb2bd3d396519dda41dc349463c9e707 SHA-1: a0dd0be9ae2952ddc71d4d73afbd5e41a6230576 SHA-256: 78d6841d23f6e68d23d0c4bf1957bd4f83a7e1a46a2169347c90b7310e3ebee2
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a 'Roomba' keyword, aligning with the heuristic findings of external URI redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8572

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 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.
  • 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
  • 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://dugedepap.ru/award?keyword=how+to+use+a+roomba+675 PDF link annotation
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/watiwevikasotope.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/volep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492536/normal_5fdc32de5dc22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_600fe39b74817.pdfIn PDF document text
    • https://lodokevez.weebly.com/uploads/1/3/4/4/134476034/rakowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454807/normal_5fd164f26dc05.pdfIn PDF document text
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/6713744.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/64237406818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_6036a9a04b910.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/pride_and_prejudice_movie_online_subtitrat.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/hdtgd17/95933076527.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/gec1Kgj/mci_airport_terminal_c_address.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/hbjfJhi/62475419176.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450037/normal_60018792abf85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_602552507a370.pdfIn PDF document text
    • https://binolopokam.weebly.com/uploads/1/3/1/4/131484395/4ef03a.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/gcgiogd/zuputagusemowavuwatajaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/dgclmk3/slither._io_mobile_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/jyqjh1j/xiduvivob.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/nezazemuzedegajuzupawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444113/normal_5fd959d0e9602.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/hollywood_the_dream_factory_an_anthropologist_looks_at_the_movie-makers.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 5348 bytes
SHA-256: df8e1f2e19b42e761ddb1a3fc164873f4e17db781c4c5c603ba1b9619c48dce5
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 10480 bytes
SHA-256: 913ff74e01817d1f5e15b05b0eba1c572da3104e0a04f236fdf35aa2b5803b8f

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