Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d4a92710779f29…

MALICIOUS

PDF

102.2 KB Created: 2021-05-03 00:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cef528317abd0a9d519cd92aa6be0756 SHA-1: 2a7f47bdf30163c16e4e6685215ae7925f72d712 SHA-256: 95d4a92710779f298c2608045b01feb143a4a32647c905ff67582444aa45a7d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF documents, suggesting a link farm or content manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=2017+harley+davidson+6.5+boombox+manual
    • https://cdn.sqhk.co/xupodafib/gihg6ib/86599963210.pdf
    • https://cdn.sqhk.co/fejukomus/jcg0hdm/crackle_paint_with_elmers_glue.pdf
    • https://cdn.sqhk.co/tugitajusow/hhjfeHX/las_cloacas_del_periodismo_reportaje.pdf
    • https://cdn.sqhk.co/tikugubobo/jXNhihi/collage_maker_app_download_for_pc.pdf
    • https://cdn.sqhk.co/verexumifo/iitiAiq/rudofo.pdf
    • https://cdn.sqhk.co/wanoziku/jbPhdhh/synchrony_car_care_one_locations.pdf
    • https://cdn.sqhk.co/jimavidozeze/2hcaZOE/8276586359.pdf
    • https://cdn.sqhk.co/sanozusu/ijgfNjj/rabigavozipixoxomifujiwiv.pdf
    • https://cdn.sqhk.co/taviboku/gXhbVYm/99319351136.pdf
    • https://cdn.sqhk.co/kigaratak/wsjgggX/planet_fitness_customer_service_telephone_number.pdf
    • https://cdn.sqhk.co/dugabolisuma/eiehgij/house_plan_drawing_tool_free.pdf
    • https://cdn.sqhk.co/posukomokufi/Frjbhik/animal_ar_3d_safari_flash_cards.pdf
    • https://cdn-cms.f-static.net/uploads/4485165/normal_601dcd6466518.pdf
    • https://cdn.sqhk.co/tumupowe/dgi5Zhf/surface_vehicle_information_report.pdf
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5fe81026be510.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sefipa/tuxujujoverajitopesu.pdf
    • https://s3.amazonaws.com/fisulefajow/ayyappa_patalu_telugu.pdf
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_d7e12606910e49e69c52d70404ec7716.pdf?index=true
    • https://s3.amazonaws.com/gomakobez/rodejibiduxonikokofavime.pdf
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_98e04532cb73479c890359d2e42081f0.pdf?index=true
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_bdab13c7c44a46ca8bb0a73827ae0a88.pdf?index=true
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_6c5b8eabb8804b088c4e2b78caa156a8.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_off00014e73.bin
826aad3e8dd205f55ffb9e6bf24908d92a9018411e0547996efd0ea9e6bc4fa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E73 6056 bytes
font_01_sfnt_off00016300.bin
db67ac7aad70e057df09624795951cb6414251e5e505d4f31c50f61bbd5cc625		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16300 11840 bytes

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