Malicious PDF — malware analysis report

Static analysis result for SHA-256 904f8b31c11b18df…

MALICIOUS

PDF

73.6 KB Created: 2021-02-15 08:07:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8ea091205cbf539fd6ab166359712d22 SHA-1: a702a92a33dfc0167abf76d3a7215cbbde24c57e SHA-256: 904f8b31c11b18df3fe044796fc1a06bfcc732436e1ffe98e828a99fb7656b72
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to potentially malicious content. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=craftsman+tap+and+die+set+made+in+usa PDF link annotation
    • http://wide-do.top/red_ball_4_into_the_caves_game10asl.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/hahe0ZZ/vitixipudafonatuzope.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/axjuUSN/sefepe.pdfIn PDF document text
    • https://gidafefutor.weebly.com/uploads/1/3/4/0/134040883/8363512.pdfIn PDF document text
    • https://cdn.sqhk.co/sijiposago/iwjbB4m/mufezekojukonubume.pdfIn PDF document text
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/e9ff2e7e8cea8.pdfIn PDF document text
    • https://fukaxoxatu.weebly.com/uploads/1/3/1/4/131438517/7705790.pdfIn PDF document text
    • http://ouily.xyz/bakupexodupapekexozo7bmlk.pdfIn PDF document text
    • https://kikebepuziji.weebly.com/uploads/1/3/0/7/130775256/mixipajobitola.pdfIn PDF document text
    • https://gejixivipoza.weebly.com/uploads/1/3/0/9/130969358/povotev.pdfIn PDF document text
    • http://presalle.xyz/xegalowubebatefeda0tsbk.pdfIn PDF document text
    • http://hhizmet.com/dna_extraction_from_peas_answers33d4w.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/O8ibiaj/41675759038.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibidizog/jgKhigf/download_game_crazy_free_kick_the_buddy.pdfIn PDF document text
    • http://hookup153.space/blockchain_programming_pythonj5bg9.pdfIn PDF document text
    • https://tugigoboz.weebly.com/uploads/1/3/4/4/134499705/renudamuxufep-jepekuluxemelul-moduwokogizupi-tuxolukedex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/bubosebonig.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/cahier_des_charges_matriel_informatique_algerie.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/48240498308.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/tonsillitis_antibiotics_treatment_guidelines.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_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 5060 bytes
SHA-256: 1708254e87603ddbffe3f9488e2dbc94fd3e0f106fa7f8e1a2b7db4a2aa7fd42
font_01_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 10728 bytes
SHA-256: 5a8494a2919d1a6e6af34c11b194de02e30f6c847baec9b0465c0985e125a2d6

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