Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf07641fcf6b042b…

MALICIOUS

PDF

81.0 KB Created: 2021-03-25 04:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3a1ccbc7fb072d35ef0ea7b8cd3a76d1 SHA-1: 8bc46411478bae0c5cc2ef8866f2fb6677f73789 SHA-256: cf07641fcf6b042b6e8972ba942af6ed6e9051a19d48ca0534f7d8e18bc69c81
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/123?utm_term=allianz+travel+insurance+brochure+pdf PDF link annotation
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/loreluxigufo_rizumeritini.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/i5Bhbje/43722545892.pdfIn PDF document text
    • http://hurleyshamburgers.com/50516965520k993d.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/fm0rjea/bogodolewi.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/6a614c0c38.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/7NYiiMj/bovumudigokesogisew.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/HXFQSjh/the_crossing_columbia_mo_service_times.pdfIn PDF document text
    • http://cashtanks.fun/183142391c9giq.pdfIn PDF document text
    • https://cdn.sqhk.co/suwefememe/jQXhjjX/movosiruzefajizis.pdfIn PDF document text
    • http://urologo.store/370119132550sa32.pdfIn PDF document text
    • https://cdn.sqhk.co/zifegowuf/8ggibjd/christmas_running_leggings.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/5752091.pdfIn PDF document text
    • https://gubulugovidenu.weebly.com/uploads/1/3/1/4/131406252/mufeporajik_kupabarur_mosonepajijo_nidokuxew.pdfIn PDF document text
    • https://cdn.sqhk.co/kowalaxu/Bwu6Kgg/zombie_hunter_shooter_mod_apk.pdfIn PDF document text
    • http://oneitshop.info/pokemon_adventure_red_manga_free_download81zft.pdfIn PDF document text
    • https://rifejirofedum.weebly.com/uploads/1/3/4/7/134763588/7990393.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/iFjhhjQ/gubufudovixuxozijepola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff3d73c-c14e-46ae-bda0-cdac844aa785/what_is_a_single_piece_of_coiled_dna_known_as.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53ab993-d8fd-465f-b75c-f57bde2693ee/4507046153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00154f33-4f4d-4ef3-a359-a719b17bb4e4/weller_8200n_soldering_gun_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d032dd-e1f7-4755-9460-6f494e73eddb/jijugiluni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c95e3cc9-d575-4462-bd32-8d09b9d17821/how_to_find_out_if_infant_car_seat_is_expired.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d94a54c3-6f5c-4514-bed7-be1f61bad7d4/gesoxitaponulufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daaeb609-0c42-461f-aef5-03cb1a2fe48a/solution_set_for_inequalities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e38a66-3770-4395-873f-a5cd688e1590/xidubififuberegudulunin.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 5484 bytes
SHA-256: e23edf9d9c8152be1fcafeec9b4edb950be78642a129a1a30806c40c520489cd
font_01_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 10904 bytes
SHA-256: 6a92ab03c9c8977a65893a23e7a06ae2d7646108d8c80fda4d4181c3a8f0e309