Malicious PDF — malware analysis report

Static analysis result for SHA-256 1391029814c62c73…

MALICIOUS

PDF

82.3 KB Created: 2021-03-29 19:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2151132e056e5c3265a4f814ac53650e SHA-1: e3a5fce7ecfbd4f21ae7c636831b270b6bfc85e2 SHA-256: 1391029814c62c7379c6463bd5f45b2fba3850baff6f24fc2f7890e04b0489aa
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to a service manual, likely a lure to encourage users to click the embedded malicious links.

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://botokaw.ru/123?utm_term=chrysler+grand+voyager+2004+service+manual
    • https://nusuvonofa.weebly.com/uploads/1/3/1/8/131872273/7778612.pdf
    • https://fejaxipanegis.weebly.com/uploads/1/3/2/7/132712099/kipifavikediboga.pdf
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/91b399370d4.pdf
    • https://cdn-cms.f-static.net/uploads/4393361/normal_6053dc4aab472.pdf
    • https://cdn.sqhk.co/tekuzorumuji/OgcUhdd/greatest_hits_of_the_60_s_album_songs.pdf
    • https://kibasixeb.weebly.com/uploads/1/3/1/4/131438563/4561270.pdf
    • https://cdn.sqhk.co/zavilisuga/FMhjal5/paper_mario_color_splash_walkthrough_mustard_cafe.pdf
    • https://static.s123-cdn-static.com/uploads/4498330/normal_60090015ab4e9.pdf
    • https://cdn.sqhk.co/luxixumogez/j9ahcia/zuwoditidipodal.pdf
    • https://cdn.sqhk.co/wasuxuletiz/tOhevhh/alexa_app_for_macbook_pro.pdf
    • https://bumogekatagod.weebly.com/uploads/1/3/0/7/130776321/8225589.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e7a61e64-26d7-444b-a5a1-db8316b228a9/panasonic_phone_number_for_customer_service.pdf
    • https://uploads.strikinglycdn.com/files/36b1ad40-41cc-4d6c-8ceb-53e1d7d074b9/fofitopefekazu.pdf
    • https://uploads.strikinglycdn.com/files/a3aa4670-deec-4fad-8f29-339ae9e1465f/helix_lt_factory_reset.pdf
    • https://uploads.strikinglycdn.com/files/feb4b437-1a3c-4d7f-a9aa-95e6d59bd7d2/79587829445.pdf
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_333f98742ed248f192ee5e569d64fef1.pdf?index=true
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_62ba8638cad549e5acca353d5131db48.pdf?index=true
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_a424b73ecb87409d8c66b065b665121f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cc66910e-816d-4a51-a824-fcc1fa3c1961/why_is_my_refrigerator_not_cold_but_my_freezer_is.pdf
    • https://uploads.strikinglycdn.com/files/a24c4410-d927-46bd-9f50-bb2615b0fd54/83329511211.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_off00010196.bin
087b2aecacedf43995d8cc05c0d439cfc1542d13ac4b546e3f1fece1baaba478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 5780 bytes
font_01_sfnt_off00011525.bin
26b4312265a2e5710ad2e4c8a5ce3ff85f2bfbea987e33b4e2229731f8b3ac38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 10720 bytes

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