Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaea13fe7d121557…

MALICIOUS

PDF

86.4 KB Created: 2021-04-06 20:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8096c6619a89e83fa359ce7024c34c8 SHA-1: ee010c331557434c9aca5543fff19a1481dd786c SHA-256: aaea13fe7d1215574ad704731b9ffdcddb4ebe78456a37243adfb7fcb93f54bc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=how+to+insert+pages+into+a+pdf
    • http://egrn-order.online/hoover_windtunnel_3_pro_pet_rewind_belt_replacementnziol.pdf
    • https://cdn.sqhk.co/lipebefaje/qR2jeii/wivepazaneb.pdf
    • http://dithetsen.xyz/little_wing_the_corrs_solo_tabi9gvw.pdf
    • http://momentikshop.space/alien_covenant_prologue_the_crossingyb8f4.pdf
    • https://cdn.sqhk.co/vedoreket/u1iiShi/best_rooting_app_for_android.pdf
    • http://wow50.pro/spider_man_comics_1963xi13g.pdf
    • http://kopalirigel.mypressonline.com/pizafukudojatefewuzova.pdf
    • https://cdn.sqhk.co/lizuloka/KgfPSJa/xebedusuv.pdf
    • http://dafagaketa.sportsontheweb.net/xojupetonakarixubakow.pdf
    • https://cdn.sqhk.co/fezifenax/Zq4Kjjl/castle_wars_2_armor_games.pdf
    • http://lightly.store/pokajewam1f9z6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5102da47-8aca-41b7-886b-313fc587243a/gusuriba.pdf
    • http://vekisofekibote.myartsonline.com/88101379214.pdf
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_50d60e207520422183ea85ce14b23f6e.pdf?index=true
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_da6522ae0d224c31b5f72687eb9f3100.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c6b44778-ce68-4922-ad06-ed081d57cf35/cdigo_penal_de_puerto_rico_2004.pdf
    • https://uploads.strikinglycdn.com/files/6a72266b-934d-4aa1-aa74-3a0cd1691c2f/dalufumexubevujorebamuga.pdf
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_957c11d444da489ab870d3bf006257d5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/19e09284-cce0-450a-a79d-a87a6ca81a80/how_to_reset_a_wall_heater.pdf
    • https://uploads.strikinglycdn.com/files/7dff4c27-2830-450a-8fe8-07655e33bfe9/what_were_the_major_causes_of_the_french_revolution_of_1789.pdf
    • https://uploads.strikinglycdn.com/files/cd89f37f-e0d3-4524-8b18-b1e247d07121/the_three_billy_goats_gruff_golden_book.pdf
    • https://uploads.strikinglycdn.com/files/e411b0c7-c221-4900-a80a-2c2f2ae09e0c/bunker_hill_security_system_manual_62463.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_off00010333.bin
a809822cec02531c613719b9eff57c6465493c1ee17bb6a5875dc458a3ce2840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 5020 bytes
font_01_sfnt_off0001145c.bin
8cd06b43fc635e853acc8f7f605c864228199597688f185641a994cbb1abdeae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 11784 bytes
font_02_sfnt_off00013c56.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C56 4324 bytes

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