Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f909b457c68129a…

MALICIOUS

PDF

82.0 KB Created: 2021-02-22 19:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bf7392a155587ad5109e66f4e6c820c SHA-1: 1b8a5f1b4d1a75a0483e1b7f2a8ef696e23cd195 SHA-256: 1f909b457c68129a2b98ac370f0ce12d188dc384d60510833e22f371a543e01a
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one that appears to be a lure for drawing tutorials, suggesting a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting strongly suggest malicious intent.

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://maypoin.ru/123?utm_term=how+to+draw+a+dog+on+procreate+easy
    • https://cdn.sqhk.co/fegujajox/c8gjpKL/23013384832.pdf
    • http://xavelodezazil.iblogger.org/6029271429.pdf
    • https://cdn.sqhk.co/jesupasuzoku/hbXjiNf/train_sim_world_2020_deluxe_edition_pc.pdf
    • https://gatojodegapov.weebly.com/uploads/1/3/1/6/131637656/xokogakowibut-fujojoremu.pdf
    • http://domainlimax.xyz/adobe_xd_mawtogr9dd.pdf
    • http://oyuncuxx.com/789945118092st92.pdf
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/f7313.pdf
    • http://funseeds.site/csx_apps_mainframephwnm.pdf
    • http://nubolutlion.xyz/tivulivvd3zy.pdf
    • http://yourlivehelp.com/balance_bmx_bikes_for_sale_near_meief8h.pdf
    • http://busibear.com/lirojilepizixub4zc82.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tesodagiwor/zemiditoler.pdf
    • http://dogazuzi.epizy.com/consumer_reports_vacuum_storage_bags.pdf
    • https://s3.amazonaws.com/wupiwupiwot/filmywap_movies_2018_free.pdf
    • http://gefetela.epizy.com/chundari_vave_shreya_ringtone.pdf
    • https://s3.amazonaws.com/pavujiniz/back_arrows_nonstop.pdf
    • https://s3.amazonaws.com/wefadep/estructuras_arboriformes_arquitectura.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102e0.bin
da07c6fad11f5fb0b630bc069937d8bec6821812c94969a308f4afa6ab56a45d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 5364 bytes
font_01_sfnt_off00011548.bin
7ea7e9e3b191ca25a33cfb288f4e84bed8244a5a4706f4052bcc13e24d9d84e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 10976 bytes

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