Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ccb8178a936349…

MALICIOUS

PDF

109.6 KB Created: 2021-03-18 15:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1d74a0a733259fb7c10b36e3818893c SHA-1: 72088792b357e97890a6b6880604b5c1b8c3b5f7 SHA-256: d1ccb8178a9363496a6d4ae0ec22211459f7cf606e3617c5ef0c7c27bfc2b44d
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating it is likely a phishing or spam document. It contains numerous external links, with one prominent URL suggesting a lure related to search engine optimization. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, further supporting the spam/phishing nature. No scripts were extracted, but the presence of external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/award?keyword=what+does+pdf+mean+in+computer+terms
    • http://zajapokel.22web.org/rukapugimovesefure.pdf
    • https://cdn.sqhk.co/melalisopapu/Fie9Bif/midoki.pdf
    • https://cdn.sqhk.co/rapalaxob/rheR2uX/sesexiwil.pdf
    • https://cdn.sqhk.co/duxadikoti/cibichd/ios_13_memoji_sticker_deaktivieren_whatsapp.pdf
    • http://towajemikof.iblogger.org/444444027.pdf
    • http://mejijajel.iblogger.org/how_to_hook_up_water_boss_water_softener.pdf
    • https://cdn.sqhk.co/rufebumu/amnhf7i/81331117891.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/414dd148-7104-4ade-8b4f-e649a6a8b734/how_to_fix_a_ge_dishwasher_not_draining.pdf
    • https://uploads.strikinglycdn.com/files/010d90f2-988d-462c-acd4-5f335d42abd8/dish_network_cable_internet_and_phone_packages.pdf
    • https://uploads.strikinglycdn.com/files/36796930-45e1-4439-ad7f-09a27b419634/45886314434.pdf
    • http://jatixafaduv.rf.gd/1792915152.pdf
    • https://uploads.strikinglycdn.com/files/9a30cc88-8bb4-4b88-a7dd-17f2f98611c6/questions_for_retail_supervisor_interview.pdf
    • https://uploads.strikinglycdn.com/files/761d309f-9f9f-43bf-bbcc-5ddc8c231e91/52926115146.pdf
    • https://uploads.strikinglycdn.com/files/7e24bf66-2ffd-45a7-a307-ad686bf46d9a/an_ember_in_the_ashes_series_book_3.pdf
    • https://uploads.strikinglycdn.com/files/94f84df0-d455-4d57-a873-7a41383b4c68/chaos_daemons_codex_8th_edition.pdf
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_4be4990398aa40969cd732cd9c3dae6e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/846ea7c1-e205-4d70-a867-0b2c79a757f1/21934533983.pdf
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_2ef77afb7c0b492c8ffd8ab26a1f1305.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e996d59f-9467-42fe-97f7-9090af1513b8/30076713389.pdf
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_4a9c92de22e442a588b7dfb39e37f2d4.pdf?index=true
    • http://dojopugoput.epizy.com/45747492489.pdf
    • https://uploads.strikinglycdn.com/files/8d367018-b41b-4b1f-8aeb-48a644436298/logistics_and_supply_chain_management_certificate_salary.pdf
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_ba8aae86bc5d438ba241ab6b6ab3c34e.pdf?index=true
    • 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_off00016ec8.bin
52bbf2abc56fcbb5d4cfab317461c5b2168046140d5c10381a4cab4ab2b95880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC8 5376 bytes
font_01_sfnt_off000180f8.bin
a2a24362b00a1cddccc22ddef716abafd78d9fa12466b861499efbdc64a5b779		 pdf-font-stream PDF embedded font (sfnt) at offset 0x180F8 11784 bytes

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