Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fd8a96d90ce341…

MALICIOUS

PDF

71.7 KB Created: 2021-02-02 08:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7a8674e5e5ef386a5e1f6a113aa634bd SHA-1: 0cd4d12760830a1310647a65b8a214ac8002255f SHA-256: b9fd8a96d90ce3414dba66cc3c70ed40e795ccc8cc4d49e2aac88f8481c40605
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support lure. 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 0.9997

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://leonvi.ru/aws?utm_term=fruit+aphrodisiaque+africain+pdf PDF link annotation
    • https://rusijarumeza.weebly.com/uploads/1/3/1/8/131871651/4900811.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/0geif77/sim_card_information.pdfIn PDF document text
    • https://tajerupabud.weebly.com/uploads/1/3/1/1/131164315/nanubivukumago.pdfIn PDF document text
    • http://covidcapsule.world/ejercicios_de_integrales_definidas_resueltos8kzoj.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/ghAs9sz/lotunezekadibamodo.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuwegijelo/ijcvR5V/vaperoxapewuverirep.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/higfifa/nickelodeon_resort_punta_cana_reviews.pdfIn PDF document text
    • http://lg-copyrightforms.com/schaums_3000_solved_problems_in_physics_downloadg6ats.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/tixamukawixikureliju.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/achcaxD/advertising_campaign_big_ideas.pdfIn PDF document text
    • http://leoidet.xyz/novenitamokakuvixedoxiwaiqfa9.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/858213962305dmuo.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/gPdXgiO/android_auto_2._9_apple_music.pdfIn PDF document text
    • https://feroraja.weebly.com/uploads/1/3/0/9/130969346/8566842.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/petejomipo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 5292 bytes
SHA-256: 70bcae14decd3304a26fe7fdd0195ddd80d8fb41dead5486c80cdb2ce6b475e9
font_01_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 10744 bytes
SHA-256: 133c0a66061eab792d670c1d9868f3f1d94d4bae6cc3df368c3d677017351156

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