Malicious PDF — malware analysis report

Static analysis result for SHA-256 9686aa62b6e3c302…

MALICIOUS

PDF

74.3 KB Created: 2021-06-06 08:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bad1dbab60b74beb9a35ac4a5ff0886 SHA-1: 860856730e3f937cd3e5ab889a1e5b60cb56f997 SHA-256: 9686aa62b6e3c302b38d4aa49efa075fc4b28aabe2e7896b256ca996aee4c3db
96 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 an embedded URI pointing to 'inwebjor.ru', which is likely the destination for the phishing attempt. The document body, though heavily obfuscated, suggests a theme of removing watermarks, a common lure for users seeking software solutions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/pbw?utm_term=how+to+remove+watermark+from+foxit+reader
    • https://cdn-cms.f-static.net/uploads/4385620/normal_60345a36bfa0d.pdf
    • https://cdn-cms.f-static.net/uploads/4501775/normal_60b97ef916d9f.pdf
    • https://cdn-cms.f-static.net/uploads/4423453/normal_603eb18088b76.pdf
    • https://cdn-cms.f-static.net/uploads/4413457/normal_601f7f63173fb.pdf
    • https://cdn-cms.f-static.net/uploads/4477163/normal_602680566c1ac.pdf
    • https://static.s123-cdn-static-d.com/uploads/4475992/normal_60b1d426b4afe.pdf
    • https://cdn-cms.f-static.net/uploads/4412768/normal_601d319fafd46.pdf
    • https://cdn-cms.f-static.net/uploads/4377697/normal_6018cb768b063.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fokopaviwu.pbworks.com/f/electronic_devices_and_circuit_theory_7th_edition_solution_manual.pdf
    • http://kokoxudalux.pbworks.com/f/how_to_set_luxpro_thermostat_tx100e.pdf
    • http://nosegawibaso.pbworks.com/w/file/fetch/144517131/55492579433.pdf
    • http://nuxawakaxaz.pbworks.com/w/file/fetch/144497355/hack_de_monedas_infinitas_para_dream_league_soccer_2019_en_iphone.pdf
    • http://vawaguzidatu.pbworks.com/f/is_eating_too_much_fruit_and_vegetables_bad_for_you.pdf
    • http://vifogajo.pbworks.com/f/kugoji.pdf
    • http://nipekari.pbworks.com/f/microsoft_word_2007_portable_descargar_gratis.pdf
    • http://kigemulu.pbworks.com/f/65399323392.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_off0000e40f.bin
4e2fbc7892ddf1f84f115d268088245fcf182a9db88ee5433b10dc803ff0b7a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 5088 bytes
font_01_sfnt_off0000f563.bin
3917254032745aaa0af6f3b7dfd274058b13c9748eb89abedae594ae06633d84
pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 11328 bytes