Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b733e9c67a1b48c…

MALICIOUS

PDF

74.9 KB Created: 2021-03-19 20:18:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7e93eb58c2b9b61eea4bd57f6837c3b4 SHA-1: 6785930ab6e5869ba56327f39ea6d1b669d16a07 SHA-256: 5b733e9c67a1b48cd7a1871972a267903f9dc7c2638e1e5892eb8bbbadfc3d67
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on redirecting users to 'xajibur.ru' under the guise of a free download. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to distribute or phish. While no scripts were explicitly extracted, the presence of external URIs and the ML classification strongly suggest malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=first+aid+express+videos+2017+free+download PDF link annotation
    • https://keboxineb.weebly.com/uploads/1/3/0/9/130969034/zadobone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_604a56649ec43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_60531c4620600.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403119/normal_5fdf7eddec5ed.pdfIn PDF document text
    • http://re-prime.ru/dd_5th_edition_character_sheet_maker3mnqi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5fce8eb069358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_603ce3ad9f6a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420745/normal_5ffc64c7beb65.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/abhinetri_kannada_movie_video_songsbdksf.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/12448908898t49n7.pdfIn PDF document text
    • https://mavusuwavonim.weebly.com/uploads/1/3/4/4/134493404/09693c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445130/normal_5ff40c91ac671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_600ecb370591f.pdfIn PDF document text
    • https://dodonebonobegep.weebly.com/uploads/1/3/4/5/134597525/pedikamod.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/zopenave/what_we_learn_in_mechanical_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c82dc6e6-4915-422b-a4aa-98fd20d49e79/xiwinipeziminedanamudozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018b507a-d03a-4d5a-95a2-039005135e06/libertad_y_limites_amor_y_respeto_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/cottony_cushion_scale_bugguide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c459a7-6cdd-4a87-b3b1-b266e590be0d/60983038900.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/avatar_game_for_nokia_5233.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/290140241.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/fekedirobagafofi.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_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 5616 bytes
SHA-256: 1afd2ac3318ae893274b6f4af12609269b929092253b76bac29150955b031fb6
font_01_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 10772 bytes
SHA-256: 568f9e07283b0067ddef31fe00edd01302913fadd861b9292b6ce0a2d090d5d2

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