Malicious PDF — malware analysis report

Static analysis result for SHA-256 f402012c9808002f…

MALICIOUS

PDF

67.6 KB Created: 2021-03-06 19:50:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c71c2bd14f044a71e497416419fddaaf SHA-1: ae8f5f8a857baf44c055a09ceb39c277f0e556f7 SHA-256: f402012c9808002f9b95c1c4952aa7b88a9fa0b78804bfeb7407af6be234c254
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, with the primary one being `https://pelibifir.ru/123?utm_term=cuantos+centimetros+tiene+un+decimetro+cubico`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL analysis point to a malicious intent to redirect users to potentially harmful sites.

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 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://pelibifir.ru/123?utm_term=cuantos+centimetros+tiene+un+decimetro+cubico PDF link annotation
    • https://sexozubo.weebly.com/uploads/1/3/0/7/130740033/moninupotinixu.pdfIn PDF document text
    • http://idealica-italiaoficial.site/75882329826rzrjw.pdfIn PDF document text
    • https://xufevojulan.weebly.com/uploads/1/3/1/3/131384667/wixogekis.pdfIn PDF document text
    • http://peuer.xyz/logo_quiz_answers_level_36455djo.pdfIn PDF document text
    • http://oneitshop.pro/star_wars_bloodline_canonox6az.pdfIn PDF document text
    • http://fuverujazifiso.22web.org/life_fitness_95xe_elliptical_reviews.pdfIn PDF document text
    • https://texelepetorabaj.weebly.com/uploads/1/3/4/7/134738155/lotakexibuvepa.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/golf_is_not_a_game_of_perfect_free_download.pdfIn PDF document text
    • http://razvivatel.blog/trail_climb_mod_apk_revdlata1p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8e3eb8-192b-4896-89d0-dda59394677b/rulotilibibipejoxozib.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/86328161950.pdfIn PDF document text
    • http://desibevazivoxan.rf.gd/simofopezasujeniko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/869b7b4e-bd93-4f8e-9a18-a95a4b74cf02/best_homemade_ice_cream_maker_2020.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/propresenter_5_windows_10.pdfIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_4fd53cbff7184daea37baf2f6236539d.pdf?index=trueIn PDF document text
    • http://malebujezasipip.rf.gd/stem_and_leaf_plot_excel_template.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_off0000c631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC631 5100 bytes
SHA-256: 4d27d8cc1af53342f497794d5ad26eb982d431d7d55b621cd08dd3854781381a
font_01_sfnt_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 12244 bytes
SHA-256: 74969461643b8355e9c56785598be427ff3ad1d007d77a869deb4221872c6dd6

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