Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa3233536abdfd4…

MALICIOUS

PDF

81.9 KB Created: 2021-03-05 09:33:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ec0751b945379314d815bdb313e06beb SHA-1: 4d0a51d6c3d59fd3d0f1709d1c428d468420a1c8 SHA-256: 3aa3233536abdfd436f349c41987d2459057b25ed718d86f7b754182e8c577f8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the primary URLs, 'https://jacksth.ru/strik?utm_term=samsung+un24h4000af+price', appears to be a redirector. The document body is heavily obfuscated and contains what seems to be metadata related to a product search, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=samsung+un24h4000af+price PDF link annotation
    • https://cdn.sqhk.co/kekotenonaxu/h0vjhWZ/xenowerk_apk_uptodown.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/49008666118.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/fDJgfjh/doluradoduwodakig.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/cjdNyvz/banasujeroxawuk.pdfIn PDF document text
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/renonawadame-kanaluk.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/ahiglhi/laws_of_the_game_fifa.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/moca_certification_test_answers.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/best_vivitar_lens.pdfIn PDF document text
    • https://rodinesupogoj.weebly.com/uploads/1/3/1/3/131384539/1947bc0b7c56077.pdfIn PDF document text
    • https://dasatupulike.weebly.com/uploads/1/3/4/1/134131314/bepakapukexazu.pdfIn PDF document text
    • https://famexowizesiz.weebly.com/uploads/1/3/4/3/134359716/pemalefujabaxotugu.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/ggggjvl/faberipoxiwugogitep.pdfIn PDF document text
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/dezeligoxupi.pdfIn PDF document text
    • https://soranetibipuve.weebly.com/uploads/1/3/0/7/130738631/3512992.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/7943230.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/4Mhb2Ot/6860485929.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
    • http://viwuwijagabote.myartsonline.com/lijazivopowat.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_0bc7aedd49ba4d72a7ebe240e1f25d57.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_e6fa6dc16a684832be729d411eb2cd0d.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_aa2d5a8c9ee34439beaecd95eab8bbd8.pdf?index=trueIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_17e6b40cdec842fbac75796b0c0a655a.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_b303f23735a64b0f8b2a69b38a277159.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 5552 bytes
SHA-256: bf44bb33b4b8b53082ef6280317f5afe5b40397ccd9564db09f797074827d58b
font_01_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 11172 bytes
SHA-256: ae72b090956573fccbcfd10bde267b0724d6b197f0587979448def3ab8d75ae7
font_02_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c