Malicious PDF — malware analysis report

Static analysis result for SHA-256 968c6ca5a95d81d2…

MALICIOUS

PDF

79.4 KB Created: 2021-03-30 23:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dacc23a252230c6783949b347084335 SHA-1: dd26ae53e377106005374c6179895fd014202ed1 SHA-256: 968c6ca5a95d81d2b5543a39e99333ee262faf72ab13a83ac5f925efdd8b10b4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed for SEO manipulation or to distribute malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The presence of numerous external links suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://kuzutuzo.ru/strik?utm_term=what+can+be+substituted+for+power+steering+fluid
    • http://organicsss.space/large_cookie_sheet_linersjka77.pdf
    • https://tesutubesonazi.weebly.com/uploads/1/3/4/6/134682982/8d141413a2.pdf
    • https://cdn.sqhk.co/xuwadezab/Ihgjahk/red_carpet_movie_premiere_dresses.pdf
    • http://semengergel.ru/wefodaviluwukovqa2xz.pdf
    • http://harmony-market.ru/liropekikugomozixuxekonxc12m.pdf
    • http://meetlait.pro/bemaverasazovataplrkay.pdf
    • https://cdn.sqhk.co/revidifok/igjjqhj/tal_adviser_guide_2019.pdf
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/badiduvelo-vagixida-lugepozez-zanipi.pdf
    • http://werirugileveto.22web.org/report_lost_drivers_license_nsw.pdf
    • https://cdn.sqhk.co/nitumatemi/eibiewU/demadeta.pdf
    • http://mebets.xyz/xulorakipubasogamqnls.pdf
    • https://zunesevofulopu.weebly.com/uploads/1/3/4/3/134385883/rurupu.pdf
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/e06d03473d.pdf
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/vavibiwame.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bozawozu.epizy.com/wumunigiguzibo.pdf
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_b92b72c9b3454478904c7aeff2a7f348.pdf?index=true
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_1ec7a0c4967f4b598b038216dc6652aa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e898fc9f-4219-4f2c-9427-27e7e3f8e0a9/bear_archery_cruzer_g2_rth_compound_bow_package.pdf
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_2a7e3be089f74e68941c85ca740892cf.pdf?index=true
    • https://e41bb7a9-a35b-4578-ac27-1eab720d379a.filesusr.com/ugd/8912ce_403f465db4b941d697842fd437a60f29.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8f52e7e9-4262-477f-b8e2-a14f7b4bc598/best_app_to_learn_french_vocabulary.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_off0000f9d1.bin
cef3a05519b91c5b27136fd97f3b76ce413e5f1afa93056c8d583ecee90f5168		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 5664 bytes
font_01_sfnt_off00010d29.bin
621c3d78ffea7d09b93636b2141e352f1b986de2dba7253369d9f8bb282ae56a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 10276 bytes

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