Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b900fb692ca54e7…

MALICIOUS

PDF

77.1 KB Created: 2021-04-05 11:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df6eb8a8693856ec86232fef15ece998 SHA-1: 9e7fe4bace3983cdc3698ec5f1b4c1c7e6dbe5e7 SHA-256: 6b900fb692ca54e7f38a5efa98d0cdfd8d571edd22f42b2d9a1fb2d8e8b9e28c
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 numerous embedded URLs, with the primary one being `https://xezojetit.ru/award?keyword=auditoria+fiscal+livro+pdf`, suggesting a phishing or credential harvesting attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by `wkhtmltopdf`, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/award?keyword=auditoria+fiscal+livro+pdf
    • http://pribor-poverka.site/soil_classification_aashto_m145re76q.pdf
    • https://static.s123-cdn-static.com/uploads/4459034/normal_60097dca0ab14.pdf
    • https://wigawiwamenusum.weebly.com/uploads/1/3/5/3/135323889/xajagatasolaz.pdf
    • http://jirekakeduvinij.22web.org/word_cookies_coffee_19_answer_key.pdf
    • http://vuvuga.xyz/213512512441epul.pdf
    • https://static.s123-cdn-static.com/uploads/4384164/normal_5feed7a271b8f.pdf
    • https://cdn-cms.f-static.net/uploads/4410731/normal_6012db4765a25.pdf
    • https://cdn-cms.f-static.net/uploads/4427785/normal_602b5c3df2eaf.pdf
    • https://doxibizogo.weebly.com/uploads/1/3/4/8/134893922/3726394.pdf
    • http://hihikane.space/spybot_anti_beacon_1._6_freehlcuy.pdf
    • http://cparta.moscow/92062766017ed110.pdf
    • http://jokeriz.22web.org/stock_markets_closed_canada.pdf
    • https://cdn-cms.f-static.net/uploads/4498883/normal_60560fddd9af3.pdf
    • https://cdn-cms.f-static.net/uploads/4481839/normal_604d21ce3fdee.pdf
    • https://sakeneri.weebly.com/uploads/1/3/4/3/134339958/4307450.pdf
    • http://7gusevshop.space/89331941287ylsu2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tisajepi.epizy.com/wanowozezajozawovipapob.pdf
    • https://s3.amazonaws.com/muvarelo/aviation_english_proficiency_test.pdf
    • https://s3.amazonaws.com/remuv/8509162456.pdf
    • https://s3.amazonaws.com/purawuma/convertir_en_ingles_a_espaol_online.pdf
    • https://s3.amazonaws.com/kalanejaxutilif/brothers_day_movie_in_tamilrockers.pdf
    • http://loxosufodu.epizy.com/65084814910.pdf
    • http://jisipisadelotab.epizy.com/52416227084.pdf
    • https://s3.amazonaws.com/bisiku/how_to_ca_cloud_campus_videos.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_off0000ea84.bin
32faca407b377529a84ed3ae25ceaa73bdf83d23125d5abd3ba916e77b60b716
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 5196 bytes
font_01_sfnt_off0000fc4d.bin
7f6026d511be1da4dfcec0fe0389762041a64db297ee37b5fbf05629499d50ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 13556 bytes