Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4db286a1a2f136…

MALICIOUS

PDF

76.1 KB Created: 2021-04-04 02:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 815eb62b4fc25f8bc7ba3c1f492343fc SHA-1: 205650172716ddf6fd250baabb44e0eab85aed91 SHA-256: af4db286a1a2f1366d9e5af811ebc45de5b2c84c2c13929a9c2dd1bc4e649abd
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to lure the user into downloading a further payload or visiting a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=fabrication+acide+sulfurique+pdf
    • http://jotetimaral.22web.org/casting_process_defects.pdf
    • https://cdn.sqhk.co/tobizopowebo/SJibhbQ/european_ice_hockey_news.pdf
    • http://lazirog.mywebcommunity.org/nuvebigolegeriso.pdf
    • https://kefuvarunif.weebly.com/uploads/1/3/0/7/130739830/zuvasonuwej_dojevokatatoso_wujajim.pdf
    • https://cdn.sqhk.co/mareduviger/ghgf4ja/katarina_guide_runes.pdf
    • https://lerasakob.weebly.com/uploads/1/3/2/6/132682990/208c23a66a9ad12.pdf
    • https://cdn-cms.f-static.net/uploads/4473645/normal_604514bcd2ae9.pdf
    • http://vegifeda.mypressonline.com/red_rising_book_series.pdf
    • https://cdn.sqhk.co/tuxonewebuke/hagdjfv/34679158902.pdf
    • https://static.s123-cdn-static.com/uploads/4467564/normal_5ff36a5d29034.pdf
    • https://cdn.sqhk.co/rogekanus/mgdVqgc/trials_frontier_hack_android_1.pdf
    • https://fakozopaximubod.weebly.com/uploads/1/3/1/4/131453484/jerewatedur-jojogofesavukid-kovutazi-vujojone.pdf
    • https://cdn-cms.f-static.net/uploads/4392457/normal_5fe770ee4375f.pdf
    • https://cdn.sqhk.co/totimujid/hhaid28/world_cup_2022_qatar_controversy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wenibeliso.atwebpages.com/mla_works_cited_file.pdf
    • http://tofilijewok.atwebpages.com/esl_beginner_conversation.pdf
    • http://xavituzupitojo.epizy.com/24503469707.pdf
    • http://sivopob.epizy.com/21685557226.pdf
    • http://bazudujowirev.epizy.com/where_is_my_kenmore_refrigerator_water_filter_located.pdf
    • http://ruxusanufip.rf.gd/free_cash_flow_example.pdf
    • http://satimizatojuge.rf.gd/captain_america_uniform_shirt.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_off0000eb8b.bin
e7987b9e7c67884624a661efcfe873c3810ee951d911e17e361ab23de8dd9af7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 5372 bytes
font_01_sfnt_off0000fdd3.bin
9da1e486ff51a0fa8ec62d27849399b5db47460b960d32388eb6afafe553f4a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 10788 bytes