Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25f4f911245c656…

MALICIOUS

PDF

75.9 KB Created: 2021-03-05 08:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d7626c6fe9fa80c5ff9e91455e04d543 SHA-1: ccdd1789bd1e18a24766bf528a952420a85dd5db SHA-256: d25f4f911245c6568ba1f8835aff8243e0ea808286541d6bd10067feb8bddf77
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting it is part of a link farm designed to drive traffic to potentially malicious sites. The embedded content, though heavily obfuscated, appears to be a lure related to search queries. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wb?keyword=which%20laser%20printer%20is%20best%20for%20foiling PDF link annotation
    • https://cdn.sqhk.co/pafevola/f3pgjgf/gowifer.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/gicghji/stupid_zombies_hack_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/d0Y00gj/pokemon_games_tv_show.pdfIn PDF document text
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/bigot.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/dijcjhQ/lefipu.pdfIn PDF document text
    • https://rinuxusopav.weebly.com/uploads/1/3/4/6/134679155/4839405.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/6611315.pdfIn PDF document text
    • https://kaxozugusejerob.weebly.com/uploads/1/3/1/4/131452826/zidosateziwi.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/f0675f2a-7b67-46bc-8555-bbb4e0a5886b/1997_honda_civic_transmission_solenoid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b68cb803-1119-47dd-8b1f-52efc90b7df5/rakubologusogeluwowixo.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_101025846bf64599859297b0cf9baeda.pdf?index=trueIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_331d2feefb3e4375a250b3f2e40faabe.pdf?index=trueIn PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_96026b4482b8403b84e1804c11010b73.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_cfe8f5d91f464b72a60f4642ec714905.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88cc48b0-aa45-44b3-9ebd-5072271eab16/stick_and_rudder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2c1ed9-9f32-4838-ac68-41c08f70c8e1/betty_azar_basic_english_grammar_4th_edition_download.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_3eae3b182c5542afaa5c1ce67f7ee346.pdf?index=trueIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_9d089753ac6440ce9c575bd35f25a540.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ffcdc0-4ec9-4fe8-95ba-b0f6544d9474/bally_electromechanical_slot_machine_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc907f5-281d-48ed-abb5-02a037ea36f2/boguxezisozurowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5405c28-d42e-4574-ab84-f7ca2d4fe3fa/earthwise_pressure_washer_repair_parts.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_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 5432 bytes
SHA-256: f47a379136c1d60686e4a90ecf474a7ccc264d1b59e1d2a50076d3fc94fde34d
font_01_sfnt_off0000fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 10672 bytes
SHA-256: 323346f11b8729dbcb384ffe408cb4d10b68c8bc50ba9bcf47601676ad44e784