Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce01e423c116413…

MALICIOUS

PDF

70.5 KB Created: 2021-04-14 20:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20e2419cfbcc8407933691099f1125fa SHA-1: bc6d1f11db01edaa4f1cb68769dc4743e5645f6c SHA-256: fce01e423c116413a55dde27662f06a0e36199220e74d75452e5e9377b1566cf
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many of which point to PDF files hosted on various subdomains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially malicious content. No scripts were extracted, but the overall structure and link distribution are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=apollo+twin+x+quad+manual
    • https://cdn.sqhk.co/xagaxubibiz/a5idgda/52114739981.pdf
    • https://cdn.sqhk.co/rufadexu/xjge5gf/dominoes_game_download_uptodown.pdf
    • http://wetiludivarag.scienceontheweb.net/tedifavubufabo.pdf
    • http://sitizinudex.getenjoyment.net/zexamakugawag.pdf
    • https://cdn.sqhk.co/sunomedude/efgdigr/65558748028.pdf
    • http://fibaxoxadomi.sportsontheweb.net/doro_mobile_phone_for_elderly.pdf
    • https://tamaxanafe.weebly.com/uploads/1/3/1/8/131856242/riradejedomuduwame.pdf
    • https://cdn.sqhk.co/kolokejo/gehiVp2/92080986389.pdf
    • https://mebavobof.weebly.com/uploads/1/3/4/5/134592521/89f3b706b6.pdf
    • http://vadosixajobirug.mygamesonline.org/18186210929.pdf
    • http://vatidenow.medianewsonline.com/the_everything_learning_latin_book.pdf
    • https://cdn.sqhk.co/difixoruze/gjgjggH/zombie_survival_wasteland_mod_menu_1._2._26.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/18aa9b5b-d752-4345-8f87-5628715c0982/39159016844.pdf
    • https://uploads.strikinglycdn.com/files/96336767-e997-466a-8b49-5a4790a3a990/58303700985.pdf
    • https://uploads.strikinglycdn.com/files/a764a0da-3466-4375-a314-ab76583032db/18474985708.pdf
    • https://uploads.strikinglycdn.com/files/e075a5ea-4610-4272-9e21-4139ac525f06/97112291.pdf
    • https://uploads.strikinglycdn.com/files/db33d362-6a4c-4ced-b0ba-80c456342fc8/burnham_gas_furnace_troubleshooting.pdf
    • http://xinifaduzinuvu.onlinewebshop.net/banking_regulation_act_1949_bare_act.pdf
    • https://uploads.strikinglycdn.com/files/0730030d-0657-48ed-847a-3ddbb108e67d/ginexaruronan.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_off0000d61a.bin
e3ba9850dccf8f445a2aefa86ff88f445c009bf1c56afff11411fcfeaffb01e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD61A 5108 bytes
font_01_sfnt_off0000e780.bin
dba47146b5a7544f533ee218a65c3b1a89b43128efc490c4f37c88c19fd5f001		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 11236 bytes

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