Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc06161544a78bd6…

MALICIOUS

PDF

85.7 KB Created: 2021-06-04 07:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f408e2939c22c7c2ea644b614ab29d3 SHA-1: 102ca4d16dcc067383dba40dafd2be2f4fde38e3 SHA-256: bc06161544a78bd6e111dd71de6dbc16d52570b98baf5a946cbf25c663171a52
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://drafthe.ru/pbw?utm_term=secret+armour+set+hypixel+skyblock PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415068/normal_6048bec7299e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502175/normal_5ffc4d7fa0d44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_6047371c6e008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481072/normal_5fe088b696e9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_606c497a946fb.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/575bd534-5a44-432d-b042-58b13b85446e/beauty_salon_equipment_list.pdfIn PDF document text
    • http://gorixose.pbworks.com/f/jegenanutarajiwosesol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539bd6a2-ec1d-4275-a30a-2b0e9f2eb868/the_pilgrims_progress_literary_analysis_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a13fd8c0-647d-43ee-9f4a-65eeb025e33d/ap_stats_frq_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d236d8-cd5f-4a0b-b01c-5ff4400c3043/nitumexewemojutedog.pdfIn PDF document text
    • http://gufabewa.pbworks.com/f/lubuzipoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d60b53-a137-4438-b7be-488636684e15/epic_emr_software_cost.pdfIn PDF document text
    • http://natofuke.pbworks.com/f/46983035684.pdfIn PDF document text
    • http://finatin.pbworks.com/f/little_black_baby_boy_haircuts.pdfIn PDF document text
    • http://refarumiba.pbworks.com/w/file/fetch/144468345/how_to_stop_borderline_personality_disorder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/970d2eec-4b6f-4e85-8cd2-e3b10893f28d/polorupud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec9d29d-186b-4430-b4ed-4511bfa55560/xopoxadoderokefagavonudom.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144515853/zajupetajanezolu.pdfIn PDF document text
    • http://faxamom.pbworks.com/f/jidiminafetuvitexiwor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a8d45a-231d-44db-8adb-e1dd227fa87a/bogexik.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/how_to_get_fnaf_2_for_free_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f341f46-d626-4f47-9d46-0bd8127b076a/28378324685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1659a8f-cb67-4164-8daa-f52434aee6ab/90302267372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a17b706-b7f3-46f6-8ba1-83aa34d6a55c/xudeferuxoxivipekowugaxal.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_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 5652 bytes
SHA-256: 7ac20f59e4c55c4ebd45953e17427a4db32e45726692ada1e15ff151c32231d1
font_01_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 11844 bytes
SHA-256: baadd4f0dcaea03dcd0dcfa8b9ac785be29b1ebe6f658af876764d741ea4ce1a