Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a3341cc6d92191…

MALICIOUS

PDF

72.3 KB Created: 2021-03-31 03:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e064ec6d44ad33db6aa245f55f30c363 SHA-1: 763f908e85f6250726aeebc0aa5416c506e59f28 SHA-256: c7a3341cc6d921915bfd7a894621b083002a47eb2fb3e30d58ec88f0dcd832ac
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a "PDF_SEO_LINK_FARM" heuristic suggests the document is designed to host a large number of external links, likely for SEO manipulation or to redirect users to malicious content. The embedded URL and the document's apparent purpose of providing information on "gastric cancer treatment pdf" point towards a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=gastric+cancer+treatment+pdf
    • https://cdn.sqhk.co/fegadosijete/cnz5gj5/survivalcraft_3_mod_apk.pdf
    • https://cdn.sqhk.co/tijinujul/bMihigJ/fiji_airways_live_flight_status.pdf
    • https://cdn.sqhk.co/kitujesijak/JShfhiV/70833280568.pdf
    • http://guzanarogenuje.iblogger.org/lg_portable_air_conditioner_10000_btu_canada.pdf
    • https://cdn.sqhk.co/tazuxalana/jhiigm8/larenakebogetukebuxasix.pdf
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/4be4ae1913908.pdf
    • http://bawikivogo.22web.org/10757318359.pdf
    • https://cdn.sqhk.co/fodumisux/jR4HgiX/diguz.pdf
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/xatipokabe-ketik-xugiwidibine-fejadi.pdf
    • https://cdn.sqhk.co/kezavilageg/egf83jc/rpg_sound_effects_online_free.pdf
    • https://cdn.sqhk.co/fakobijo/fhchbxB/79111915614.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/63464069-c543-4b51-bfe6-d71399ba5aa6/what_adjustable_bed_base_is_best.pdf
    • https://uploads.strikinglycdn.com/files/89fa75c5-02d0-4d5b-abcc-9ae5ad06c210/rugorin.pdf
    • https://uploads.strikinglycdn.com/files/01f9c6e8-2325-4faa-a008-789b06d6c750/labewivomid.pdf
    • https://uploads.strikinglycdn.com/files/599fbe4e-c49c-463e-ab44-2104217feea1/kogakanikowuzamezazebita.pdf
    • http://gigosaz.epizy.com/71362320974.pdf
    • http://gukasitaxe.epizy.com/cant_stop_wont_stop_book_free.pdf
    • https://uploads.strikinglycdn.com/files/464bb5e8-b542-4f2e-ab1c-af35aa1260e5/how_to_get_money_cheat_on_sims_4_xbox.pdf
    • https://uploads.strikinglycdn.com/files/cc2d23ee-cc32-4e10-8590-e86d107bc2f5/how_do_i_check_my_driving_licence_status.pdf
    • https://uploads.strikinglycdn.com/files/49b7601b-9244-4d26-b5f1-f70094717f31/2012_can_am_spyder_service_manual.pdf
    • http://lamavij.epizy.com/butterfly_valve_types.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_off0000dfb2.bin
69900f4cf1676eeaa1062c5ac4853dc6ceb00a5a80a2f229ce831b597fd15740		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 5300 bytes
font_01_sfnt_off0000f1a7.bin
7441d897af0e4ed4ab3636853e86b434994953e61b7b65508d43bb63da903a03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 10020 bytes

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