Malicious PDF — malware analysis report

Static analysis result for SHA-256 f806db2f12f8b4c5…

MALICIOUS

PDF

83.6 KB Created: 2021-03-10 22:30:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1daa19c2142d4f2ee2238763a68968d SHA-1: 25f8d50be01783c0b4d7160b480ecadcc93446bc SHA-256: f806db2f12f8b4c5bbeb828153c0b1c33deb33815d23b77386187ab4a7307b94
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are disguised with seemingly legitimate titles, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially malicious websites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/aws?utm_term=wolfgang+puck+pressure+oven+user+manual
    • https://cdn.sqhk.co/livatunozasu/oTsjheh/winning_wsop_free_texas_holdem_poker_online.pdf
    • https://zesoxomilojul.weebly.com/uploads/1/3/4/0/134018604/wepojekutalaz_kopilizomege_jupemegema_pomuloxapeked.pdf
    • https://cdn-cms.f-static.net/uploads/4382201/normal_603c77b9e098d.pdf
    • https://cdn.sqhk.co/paxepilekot/jjjhhgW/color_splash_effect_application.pdf
    • https://cdn-cms.f-static.net/uploads/4377115/normal_601877469e32e.pdf
    • https://cdn-cms.f-static.net/uploads/4401555/normal_6020fc95c43f7.pdf
    • https://cdn.sqhk.co/wijelukifap/E5Ihf1N/air_horn_mlg_dank_meme_prank_buttons.pdf
    • https://mimedotaxejibi.weebly.com/uploads/1/3/0/8/130873786/nisetu.pdf
    • https://cdn.sqhk.co/zifeduwa/fgf57jf/friv_2019_love_tester_3.pdf
    • https://cdn.sqhk.co/mitapupafono/hdib2ic/puppy_wallpaper_hd_zedge_iphone.pdf
    • https://cdn.sqhk.co/tamejenonisi/gheiehf/vebidinowodenolebataka.pdf
    • https://cdn.sqhk.co/kepilujofeje/jeghZlP/zazijixebabexudoj.pdf
    • https://cdn.sqhk.co/sanobude/Zxjew5I/panic_alarm_home_security.pdf
    • http://kakopase.iblogger.org/jupatiwowa.pdf
    • https://cdn.sqhk.co/rugofufol/hgieibs/6417947704.pdf
    • https://cdn.sqhk.co/fakobijo/PhegikB/cheats_for_mortal_kombat_x_xbox_one.pdf
    • https://cdn.sqhk.co/wajerewuwer/RlrjgQY/nupepogarupipojivawivu.pdf
    • https://cdn.sqhk.co/vefutifeves/Q6jiiiB/free_hd_movies_2020_watch_free_online_cinema.pdf
    • https://cdn.sqhk.co/silijebutu/Lhhifib/galaxy_combat_space_shooter_alien_attack_premium_mod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://welolazudadiv.epizy.com/ryobi_backpack_leaf_blower_electric_start.pdf
    • http://xosareregaka.epizy.com/my_talking_angela_apk_latest_version.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc6b.bin
4d7f10765690d85b29804a2e64e1fca25854d6aed5975bf7fbd26c8ee2f2b0a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 5228 bytes
font_01_sfnt_off00010e34.bin
96d95f9845c3df63ca1fdb414dd5feef1ae2ebb41aef2a6549c86f9cbcabd52d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 10772 bytes
font_02_sfnt_off000132ad.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 4324 bytes

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