Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fcef9034edc04e…

MALICIOUS

PDF

89.4 KB Created: 2021-02-20 00:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4e82e3d36f7b1f3bc89d5963268c7b27 SHA-1: bee6c263d0837c990013c1e526ac6dc980af99e8 SHA-256: 89fcef9034edc04e75ca86cbea9d40516e542fde0a8b1c9bf40dab71c8002036
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to harmful sites. The ClamAV detection and ML classifier also strongly indicate maliciousness, specifically flagging it as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the presence of numerous unknown and potentially malicious URLs points towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=skyrim+special+edition+change+mod+load+order PDF link annotation
    • http://aduo5.online/472944130094b7xx.pdfIn PDF document text
    • https://midatapeb.weebly.com/uploads/1/3/1/0/131070166/9092455.pdfIn PDF document text
    • http://ctyr.ru/make_spreadsheet_fit_whole_pagev9cy7.pdfIn PDF document text
    • http://otomail.business/math_brain_teasers_for_adultst839r.pdfIn PDF document text
    • http://ludshop.xyz/how_to_get_arborist_license_in_louisianad9s6f.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/zunimigovebi.pdfIn PDF document text
    • http://xtreme-sport.ru/nubuvakobaxiritaj8brbg.pdfIn PDF document text
    • http://aires.fun/kirefuluzur6cv3w.pdfIn PDF document text
    • http://autoupgrade.website/juwugabodofuzavohnzp9.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/tobito/bangla_baul_dj_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/huckleberry_finn_movie_1939_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/gaming_browser_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/90507559913.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/rinnai_hot_water_heater_prices.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/balloon_hovercraft_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/44825702931.pdfIn PDF document text
    • http://zinikifog.rf.gd/gipewovitesawunuxo.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_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 5756 bytes
SHA-256: fcdd3cbf12c0975ae404cd0ae99dc069378c8d5428f6fb7d17044baf0e157ae5
font_01_sfnt_off0001313a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313A 11532 bytes
SHA-256: 5388552a2cdde8983a8c61c4664a8c88cb70be2df9a55fb0d5dbe9e70574be01

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