Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a31e81e9feb3e86…

MALICIOUS

PDF

83.6 KB Created: 2021-03-14 13:28:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc281fa18703a30e3decc4e83898fa66 SHA-1: e17ad94281405ac826e029de502c578b3e9bb370 SHA-256: 4a31e81e9feb3e86befba0f3f01919c4b9f6f52a057608d13515293f5cd345b2
96 Risk Score

Malware Insights

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

The PDF contains embedded URLs and was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to reference online conversion and clothing, suggesting a lure to a malicious website. The presence of external URIs indicates an attempt to redirect the user to a potentially harmful site.

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://kuzutuzo.ru/wix?keyword=www+online+conversion+com+clothing+htm
    • http://zavivobatiwiga.22web.org/are_boston_market_frozen_dinners_healthy.pdf
    • http://sokobumoxagug.scienceontheweb.net/tratamiento_de_la_rinitis_alergica.pdf
    • https://cdn-cms.f-static.net/uploads/4494674/normal_603c610034105.pdf
    • https://static.s123-cdn-static.com/uploads/4471509/normal_5fe1ac0910877.pdf
    • https://cdn-cms.f-static.net/uploads/4390664/normal_603f7dfdec8f9.pdf
    • https://cdn-cms.f-static.net/uploads/4489838/normal_603e719cbe350.pdf
    • http://kimugifogetami.medianewsonline.com/95194682985.pdf
    • https://cdn-cms.f-static.net/uploads/4443810/normal_601a56f117546.pdf
    • http://guwejusu.22web.org/canon_g7x_iii_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4490961/normal_6010e63f17f6a.pdf
    • https://static.s123-cdn-static.com/uploads/4420235/normal_5fffffc7ae682.pdf
    • https://cdn-cms.f-static.net/uploads/4417659/normal_603b066044184.pdf
    • https://cdn-cms.f-static.net/uploads/4490523/normal_601b9b8768f55.pdf
    • https://static.s123-cdn-static.com/uploads/4383688/normal_6007a7d58c4c8.pdf
    • https://cdn-cms.f-static.net/uploads/4460461/normal_6026d6c6eb49f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rurosaveruk/a_practical_guide_to_evil_liveblog.pdf
    • http://bajipodi.epizy.com/chennai_city_gangsta_audio_song.pdf
    • https://s3.amazonaws.com/tesasubawalozan/71485679242.pdf
    • http://wufagezigedo.onlinewebshop.net/magnavox_hdd_dvd_recorder_h2160mw9.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/oxford_word_skills_advanced_vk.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_off00010ab1.bin
d2bfb74d9dd6e1e41ec6f244100b24efdb12bb0b45393b7a35215b7e7b7e56e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 5168 bytes
font_01_sfnt_off00011c39.bin
6aa5c64bac7e413dd0d79c085e291dd72f7a69a7674e753cfe483cc7e55e75ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C39 10792 bytes