Malicious PDF — malware analysis report

Static analysis result for SHA-256 174c97f85e63bfab…

MALICIOUS

PDF

78.2 KB Created: 2021-05-18 18:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c8ce7614c3504d7cc2aa43c95ca34229 SHA-1: 53be93cbdc34c93a23aecb78d2dbace715d4963c SHA-256: 174c97f85e63bfabd867630051b95c103ca381006762ca4ebbbd832004fe1f33
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 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://fokemale.ru/strik?utm_term=bearing+trigonometry+worksheet+with+answers+pdf PDF link annotation
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/ddd139c5d00e4.pdfIn PDF document text
    • https://mefiremen.weebly.com/uploads/1/3/0/7/130776246/7320784.pdfIn PDF document text
    • http://gosofejabe.iblogger.org/dadimatogezaxaw.pdfIn PDF document text
    • https://gemikomumupoj.weebly.com/uploads/1/3/4/3/134393585/gusokogese.pdfIn PDF document text
    • http://vubunojetufofi.iblogger.org/how_many_practice_questions_cfa_level_1.pdfIn PDF document text
    • https://rijumiwotoresu.weebly.com/uploads/1/3/4/4/134490354/xedadefeguxolike.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/vugekiriradoxit_golegox_baraw_lawalojiguze.pdfIn PDF document text
    • https://nubesojobe.weebly.com/uploads/1/3/1/3/131398221/2380864.pdfIn PDF document text
    • https://tipipiteker.weebly.com/uploads/1/3/0/7/130775441/xuforaguladogutokal.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/5f0a6669-e26c-477f-a0d8-7f455861ced1/badger_insinkerator_5xp_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3676cc4-78b5-439f-861b-b9804f85aeeb/bose_901_speakers.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/68574970956.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/48212517993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd4a299-c02a-4695-8c6f-35d31d075aff/live_candlestick_chart_indian_stocks.pdfIn PDF document text
    • http://foduvikedumule.rf.gd/97493352781.pdfIn PDF document text
    • http://momoxorepuvo.epizy.com/railway_reservation_form_in_english.pdfIn PDF document text
    • http://temomuduzuba.epizy.com/product_canvas_template_word.pdfIn PDF document text
    • http://xiwinuxad.rf.gd/30809183244.pdfIn PDF document text
    • http://kofadokajofej.epizy.com/canon_eos_rebel_t3i_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/70934061650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b539542e-8f22-47b5-923f-d958e0dc6457/88858773241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa3ecc1e-d8da-4d78-bb0a-a31bed254eea/85843169191.pdfIn PDF document text
    • http://karifopiti.epizy.com/the_monkees_im_a_believer_release_date.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_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 5732 bytes
SHA-256: afc17e9ad127426ee1c176da65d48a3ef8867860795791b2dbcffc90b4da9413
font_01_sfnt_off000104e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 11348 bytes
SHA-256: 1641c0d5ddea9ea3f0230e3f63fd671a43b8ad2842f71a70ceda5f74cc5c9d7e