Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4b3df1b8f464d8…

MALICIOUS

PDF

79.6 KB Created: 2021-03-14 09:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 68c0d58efc1fee7ebdeb3125b0a273d6 SHA-1: 80e59ab066e33c66a3b59ecc752003bfc855c92e SHA-256: 4e4b3df1b8f464d8e2ed5ebcf0399cae2082722127c24b4a8f6c0772320048e0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute SEO spam or potentially malware. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of numerous external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/wix?keyword=assassins+creed+android+apk PDF link annotation
    • http://reduslim-officialsite.site/prefixes_and_suffixes_exercises_for_grade_4rn7pw.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/fiiigjr/35890043616.pdfIn PDF document text
    • http://trokot-shtorki.online/xopikufosikobajazbiz8.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/ehi3zii/cardboard_sheets_walmart.pdfIn PDF document text
    • https://silujufadusume.weebly.com/uploads/1/3/1/1/131164496/2848003.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/vjfghdr/you_got_a_text_message_funny_ringtone.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/FtKjajE/urban_fight_club_championships.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/you_before_me_full_movie_english.pdfIn PDF document text
    • https://wuxorazaw.weebly.com/uploads/1/3/2/7/132712222/da6512dd7.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/7287652.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/mixanadezuvox-vofomogunuxar-tawipesig.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/gfNxgfr/69439157511.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/S4vC7f3/tomikiluramamuwizexowoz.pdfIn PDF document text
    • http://help-copyrighteamservice.com/behringer_xenyx_1202_dimensions43b70.pdfIn PDF document text
    • http://kindraretterath.com/the_beginning_of_everything_season_2_episode_17v2fy.pdfIn PDF document text
    • https://cdn.sqhk.co/rasadenibe/c4BBPgc/28104762821.pdfIn PDF document text
    • http://salimom.mygamesonline.org/linear_algebra_a_modern_introduction_4th_edition_david_poole_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_b62aed6fa8da4ace8dfc0abc3a33ad78.pdf?index=trueIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_c014957c8eb2460c8996916f3afb2efc.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_51317cea7b7442fea449bf26bd2c4c4f.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_3006e26e0e6547c2978155c6a687adcd.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_84730e78247d4fdfa265f3eacae4c241.pdf?index=trueIn 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_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 4796 bytes
SHA-256: ca306c3010f21681078bff15344634bb13992cdb75e8c812aa245ad704a255cf
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 11260 bytes
SHA-256: 94953aeb47abe947b38560cab1169e89a0742e93753adee1a8c43f91282bc354
font_02_sfnt_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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