Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bc1ea4ec6b5848…

MALICIOUS

PDF

79.7 KB Created: 2021-04-02 01:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 550c62f5c75898ac937c940009130291 SHA-1: 29635d8c7fae235fc6e48faa1e29d02bb34e2005 SHA-256: d3bc1ea4ec6b584899ee6746e7e8f7526fe778f6516f0efa6a9d56881be29a12
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL suggesting a lure related to resetting a TP-Link router. The PDF's structure and the presence of external URIs indicate it's designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/strik?utm_term=reset+tp-link+tl-wr841nd PDF link annotation
    • http://yildirimotobursa.com/1910343324812p5u.pdfIn PDF document text
    • http://nuverlites.online/jetufudadokijaxedzs95.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/17364531328.pdfIn PDF document text
    • http://faxagamebajara.mypressonline.com/daxepo.pdfIn PDF document text
    • http://smirno.life/brunswick_marine_emea_com9dz05.pdfIn PDF document text
    • http://potaberukogox.66ghz.com/xorosuworakesewunidutosup.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/tony_little_gazelle_freestyle_elite_cross_trainer.pdfIn PDF document text
    • http://prodive.su/rururavekjx91s.pdfIn PDF document text
    • http://kemirekijav.22web.org/jpg_to_excel_small.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98c07b4-7f71-496e-bfeb-6fa5d6b71d64/56399548153.pdfIn PDF document text
    • http://zavulelobawabi.onlinewebshop.net/bloody_chamber.pdfIn PDF document text
    • http://godusisoti.onlinewebshop.net/70413195606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cdb990-72c9-454d-a87a-7f0a5b509152/how_to_get_army_correspondence_course_hours_fast.pdfIn PDF document text
    • http://werewipabelud.rf.gd/active_and_passive_voice_quiz_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8989897a-ad40-406d-a556-cb7ceaa17926/gozolepugolim.pdfIn PDF document text
    • http://mepigaruvuj.rf.gd/celtic_knot_designs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/344b2c7a-f3ca-4c80-a249-66f349fda682/bulokoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f753318-d146-4d26-b0d3-d232b084e95a/the_complete_film_production_handbook_companion_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5fbc9b-688f-4182-8fb1-85e64651eb04/what_is_the_best_undercounter_ice_maker_for_home_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c4df71-fcc3-4ebd-a9b1-ba33a3b672d6/32822256714.pdfIn PDF document text
    • http://josetevuj.epizy.com/dovufavukizeruruson.pdfIn PDF document text
    • http://favuwipeg.rf.gd/all_i_want_for_christmas_is_you_piano_easy.pdfIn PDF document text
    • http://wupepiwora.rf.gd/internal_hedging_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f26fb2-7840-4141-be52-0387b91fd9a1/4_pics_1_word_level_265.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 2960 bytes
SHA-256: 00c0a141202c10936ceac8b8df9df75720096dbedde9c5fde8d9f3447cbb363c
font_01_sfnt_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 5272 bytes
SHA-256: 8f633e3cfd88fef5d405e8f9ee740a38a2bcf9c84abcd3218b23eb6b5b79ab0b
font_02_sfnt_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 10564 bytes
SHA-256: 5fb4a391cd644d084f6abaf3be285413f42a80f23cca180fe47f935ab04ca449