Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dd3994d5bec11a…

MALICIOUS

PDF

84.5 KB Created: 2021-01-30 06:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91c33673a99e60505e990da47d3b83fb SHA-1: ed9e71726c34d79992dda734e029ab2b80712ed7 SHA-256: 87dd3994d5bec11a87239097940abd853b92b32d2a1936a2add1de827d7c9de8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://baarspo.ru/aws?utm_term=tagalog+bisaya+dictionary
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/tularuvejevadorux.pdf
    • http://trokot-tonirovka.online/koxofad7dtw8.pdf
    • http://logunej.iblogger.org/best_carrom_board_games_for_android.pdf
    • https://cdn.sqhk.co/pubodegosog/hcUhht0/how_to_boost_your_children_s_self_esteem.pdf
    • https://fakoronad.weebly.com/uploads/1/3/4/7/134712901/vuturot_kipatigavorosu_jivasub_lugufokexevo.pdf
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/nitob.pdf
    • http://indohealth365.online/kepataxigepiwivozoi1v43.pdf
    • https://buvupoxiku.weebly.com/uploads/1/3/4/3/134329971/9537226.pdf
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/6d6504a.pdf
    • https://rasizuxuner.weebly.com/uploads/1/3/1/3/131378923/3576a705.pdf
    • https://cdn.sqhk.co/duditizonut/gFxEjdJ/car_mechanic_simulator_2019_ps4_price.pdf
    • http://wordsidepost.top/crash_racers_toyhs1v1.pdf
    • https://cdn.sqhk.co/vuguvorexi/eifjbDL/nintendo_switch_parental_controls_meme_compilation.pdf
    • http://eeeeeyyy.space/xefisodasakkowsj.pdf
    • https://cdn.sqhk.co/genopeno/ShjY3hb/tubujekijebapuneriti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://winulesodix.rf.gd/packet_tracer_inter-_vlan_routing_challenge_answers.pdf
    • http://fizufanotujo.epizy.com/94887214887.pdf
    • http://zogojazaje.rf.gd/xenumu.pdf
    • http://kewivawegimomu.epizy.com/nutrition_information_burger_king_taco.pdf
    • http://lulojoduvos.epizy.com/after_effects_expressions_book_free.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f681.bin
055acab186f7958030e8aa30f55332ce8fa4b7dcf75de04ce4a591092c50fe5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 5296 bytes
font_01_sfnt_off00010895.bin
ddde3ba6f401cbbdb2576a494df9d075fe37f5fc44074072e824a216ab4d7e39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 11824 bytes
font_02_sfnt_off00012fc1.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC1 16036 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.