Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88920abd6041cdf…

MALICIOUS

PDF

97.7 KB Created: 2021-03-21 01:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8a8b9fd4ffdc1be79fd94b7c41becce2 SHA-1: 122d601727f40cdd5a5b551ccb757ceea0450414 SHA-256: c88920abd6041cdfa4940164b09cabb4933753935feb932c08fef90ae372ae09
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=google+photos+remove+duplicates PDF link annotation
    • http://natbeach.space/fisulukexeguvosujopdfgmv.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/OigV8jd/73111422211.pdfIn PDF document text
    • http://falujojul.22web.org/how_to_answer_ethics_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/ehbijIo/bally_bingo_pinball_machines_for_sale_in_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/ryhdidF/xamikex.pdfIn PDF document text
    • https://cdn.sqhk.co/saxamabewido/jtkhcjh/mx_player_best_web_series_tamil.pdfIn PDF document text
    • http://probmake12.xyz/85599131694suuqr.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/bihjbgi/drag_and_drop_not_working_in_outlook_2013.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_7383b7672e1d45fb80d8e4a496d89c6a.pdf?index=trueIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_69a1885ab039417c8e1dff99843bef45.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_b9c8a578442f484594392fe5c2f5d9cf.pdf?index=trueIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_a7bfb7ff82334610b6f63b662ce19a41.pdf?index=trueIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_5c4f7201f7124d26a5aeb89b39efa03a.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_69415eb1cd9740ff8c39cb3d214a90f3.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_4167c990016c48e987687da593cfed1f.pdf?index=trueIn PDF document text
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_78d8dc3c33394bb1ba62c0f21a826c20.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_41c77959c2184a78b9c11592722cacbb.pdf?index=trueIn PDF document text
    • http://julivaradisakit.rf.gd/90443289919.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_1ff061d1e4e24385b7de6e2168e539f6.pdf?index=trueIn 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_off00013d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9F 5576 bytes
SHA-256: b28dacddda43aa56262feed730b79bcf48fa8a379cd93a2d417ca40f53880c82
font_01_sfnt_off0001507b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507B 12176 bytes
SHA-256: 527b852c9a30935ab8914fd9e5f78e15888dfe54ab9e67b2dcfe1948dd8fdd94

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