Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36860eed63f9078…

MALICIOUS

PDF

82.3 KB Created: 2021-03-23 18:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 730f353ae2eba38901df5bde85b822ef SHA-1: b3a86140fc015d4396706ce3423c2938d2e946c1 SHA-256: e36860eed63f90787fde8782d68484eacb83aac98b635a1f294d624b9c16aa7c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=pedal+power+2+plus+strymon PDF link annotation
    • http://nat-fru.space/sony_vegas_pro_15_serial_numberitrhx.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/dSjhib4/avatar_maker_picrew.pdfIn PDF document text
    • https://cdn.sqhk.co/bisadidizi/e1hdVmb/27179623603.pdfIn PDF document text
    • http://indital.space/mii_channel_theme_piano_sheet_musicrw6up.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/uQhaido/79888740771.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzodidudi/8hbAgi8/monster_quest_pokemon_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/jj7hhjc/color_passion_twist.pdfIn PDF document text
    • http://hookup666.site/10017952256uel7z.pdfIn PDF document text
    • http://inscarusa.info/ff14_heavensward_anima_weapon_guidezaa9a.pdfIn PDF document text
    • http://supernefritroller.xyz/exercise_for_seniors_with_parkinsons_diseaseh1xi7.pdfIn PDF document text
    • http://blognews.top/bexigivedovevonelomirav2pkrn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_b0d6436d47e94066bb71ce20e0323aff.pdf?index=trueIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_78da5032e9bb4f2baa583e6d27798190.pdf?index=trueIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_827a3980512343bc86d29c38d500de24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/laxejujanagujitidujif.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_f9e852b8aca74986a72ce4d997627327.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/how_to_write_a_short_travel_story.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_4a182bce625e45428bb391abd60879dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/luwewugapemagofuwonuli.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_263712fb94e943f7821809f9df848b72.pdf?index=trueIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_831ddfb4391c4c32a441aa7134c74b64.pdf?index=trueIn PDF document text
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_fe35eb2b079d4bed90a7f5b3394f227b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/foneniz/66936038113.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 5432 bytes
SHA-256: 36fd37024d05df32b095072e33b38f74dfa41f4899858d2209d8e0af8f4f6986
font_01_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 10904 bytes
SHA-256: 1c61bf17dbfe59ad75860c57805490bd239ca1ff5f2e493c7f43c42f94617164
font_02_sfnt_off000124fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FC 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e