Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0369c48c0b3920…

MALICIOUS

PDF

78.8 KB Created: 2021-01-20 04:23:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 90f8ede05c5c578db585e7adba579787 SHA-1: c560542dfa00ece08015394cf6f8e67aad650ee0 SHA-256: db0369c48c0b39203d53e72a0fde2654261dd82eafdbfe845bdfd8ac6c6ce774
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts strongly suggest a malicious intent to distribute malicious content or phish for information. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=pale+blue+dot+carl+sagan+pdf PDF link annotation
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/9504736.pdfIn PDF document text
    • https://site-1167953.mozfiles.com/files/1167953/zombie_attack_java_games.pdfIn PDF document text
    • https://suzexefovewav.weebly.com/uploads/1/3/4/6/134640410/7047607.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/fatejuwaj-rojemo-nizipavetib.pdfIn PDF document text
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/gozejefep.pdfIn PDF document text
    • https://site-1175150.mozfiles.com/files/1175150/38987816036.pdfIn PDF document text
    • https://mivagefe.weebly.com/uploads/1/3/1/4/131453450/bijoxepakodew.pdfIn PDF document text
    • https://tewizoduwab.weebly.com/uploads/1/3/5/3/135341898/sofosawara.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/9582197.pdfIn PDF document text
    • https://site-1178171.mozfiles.com/files/1178171/volezunajedevasamel.pdfIn PDF document text
    • https://site-1201164.mozfiles.com/files/1201164/descargar_kpop_piano_bts_tiles_game.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/rilexazejuzovep/18886374655.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/78112413258.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_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 5464 bytes
SHA-256: 4fa85a29e217a5efafd3f34334b98aeff95a50f721ba1ebe5e558c804a08c619
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 10616 bytes
SHA-256: e3b4b638b3e3fef71bd981871d466283589cf1a0c93659e7e58e1520b11fc3e2

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