Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bbd8000f6bf74e…

MALICIOUS

PDF

73.9 KB Created: 2021-02-23 03:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 865172d3097571825b6fbe0fcd7f95c0 SHA-1: 1fbbc985339767d4df127bfe6db495d53446fd24 SHA-256: f0bbd8000f6bf74e819432e9bd2a7f3468fa3d86663e40ab40964fcefd1b7dc1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially garbled, indicates a lure related to document types, likely to mask the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/aws?utm_term=diferentes+tipos+de+archivos+documentales PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424935/normal_5fe0bb6aee1b5.pdfIn PDF document text
    • http://gufutaca5.xyz/57445814864vqlfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_6021014aad88a.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/qziaaic/big_bang_theory_theme_song_acoustic_chords.pdfIn PDF document text
    • http://vinnipoh.fun/52755818770j4sgb.pdfIn PDF document text
    • http://bitsracing.net/classical_guitar_sheet_music_easy0ayzx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488566/normal_600c1d817dfad.pdfIn PDF document text
    • http://znakomstva69.space/22390003961yg0k4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_6025dd745aa8f.pdfIn PDF document text
    • http://pubggaming.online/674929463962jj2l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_600eb247e29c5.pdfIn PDF document text
    • http://topcreditmonitoring.info/53326111043a3g0g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366957/normal_5ff71409022f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448110/normal_600e003c6f219.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/nitajosasa/47644800986.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/pilugilus.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/triangle_congruence_worksheet_2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FB 3080 bytes
SHA-256: 5510861e0701cb7f7f57c1c4f6c9cfe19f8a483cefdede93edc0bf9cc0aea221
font_01_sfnt_off0000e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 5452 bytes
SHA-256: 233ebf6fd3737b8764b073114b0a09401d0435b30a6e1c55ca6d1fb153a97d2c
font_02_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 11280 bytes
SHA-256: 24346fdcde8243e797afece26828dec50a76bf17b15c83d9b3731dc52a605f7f

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