Malicious PDF — malware analysis report

Static analysis result for SHA-256 17968d4ace3a1a6a…

MALICIOUS

PDF

75.2 KB Created: 2021-04-06 07:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dd3a506305c8480507d2edc5f39db5c6 SHA-1: ceb133db684c95d010321f48fc115789334e75c0 SHA-256: 17968d4ace3a1a6a969017100510c7a0f4ebde6aa7ed92ad6d8f4ef6b7b8ef9b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily corrupted, contains text related to 'ac dc highway to hell guitar tab pdf', which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://jacksth.ru/award?keyword=ac+dc+highway+to+hell+guitar+tab+pdf PDF link annotation
    • https://cdn.sqhk.co/vakolitakap/i8ifxib/basketball_president_manager.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/vphhDUo/29298192364.pdfIn PDF document text
    • http://tiriruno.sportsontheweb.net/65765045587.pdfIn PDF document text
    • http://kogowetek.getenjoyment.net/59662217099.pdfIn PDF document text
    • http://grizhoff.ru/3959525415a6q7m.pdfIn PDF document text
    • http://kalukawuwo.mygamesonline.org/williams_hematology_10th_edition.pdfIn PDF document text
    • http://lutafem.getenjoyment.net/95487533784.pdfIn PDF document text
    • http://montana-media.com/sentence_of_weekend_breakizywk.pdfIn PDF document text
    • http://ehaberdevlet.com/55112669602ip3mu.pdfIn PDF document text
    • http://christinaanddavid2019.com/motifs_an_introduction_to_french_6thz0il9.pdfIn PDF document text
    • http://nikecortez.net/bakivitenapuguvakodefeknst2r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ba2ac24d-ac65-4361-afa8-dfd8c36cad39/gofebararonolen.pdfIn PDF document text
    • http://fadudenomo.onlinewebshop.net/effective_communication_skills_workbook.pdfIn PDF document text
    • http://jakukimokop.rf.gd/emerson_coriolis_flow_meter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec89b7d4-d6b7-45c5-abee-5b90bf023d93/datawitisokunevexivujoruk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f04e5e-cd88-46b3-81d1-f32145cdaf81/social_contract_theory_hobbes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e02cb76c-8371-47a9-bab7-ca4e543bd77d/49101646346.pdfIn PDF document text
    • http://jamudux.epizy.com/3548071740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146e174d-2bf4-436a-967f-41c5475c1c59/yard_machine_tiller_belt_size.pdfIn PDF document text
    • http://pojudezafal.rf.gd/bcom_law_uj.pdfIn PDF document text
    • http://ruxomipeb.epizy.com/68144059015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6cc7695-9a28-4959-a3a0-bdd0632e5a57/nutrition_an_applied_approach_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea744ff0-1eaa-495e-9b83-d7d3ad270f74/xefoj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 5340 bytes
SHA-256: d7c2e9b6bcc2c1a63dfe8a590bd8a2a12b85b7079ab11bbd6b5dbe91f3eb21cd
font_01_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 11560 bytes
SHA-256: 7565d5eea40126ddb0977caef83cbb7a3a1332ae218c56f4e2e8a33f8036a265
font_02_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378