Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99cf9b8a76a4728…

MALICIOUS

PDF

77.8 KB Created: 2021-02-16 01:35:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 08aca6395f47228998c984b49927a502 SHA-1: 5a62a5b8ef0cd5b3cb60abc714774caebbdb595b SHA-256: e99cf9b8a76a4728df79e3782b61a1c649c407702becae235b828c90216b65f5
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 0.9998

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://seumenha.ru/strik?utm_term=how+to+set+a+danby+dehumidifier PDF link annotation
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/zupewiwemag.pdfIn PDF document text
    • http://healsmall.space/2814581547352pye.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/7933086.pdfIn PDF document text
    • http://krokoboko3.xyz/489529385734gu1v.pdfIn PDF document text
    • http://naturagrush.space/afk_master_best_heroesq78lo.pdfIn PDF document text
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/5040931.pdfIn PDF document text
    • http://marketitaly.info/check_writing_worksheets_for_studentsf9du9.pdfIn PDF document text
    • https://wobifezoredeju.weebly.com/uploads/1/3/5/3/135323063/4b38c.pdfIn PDF document text
    • https://kagejiwuj.weebly.com/uploads/1/3/4/0/134095923/levekeka-gisubamo-mulom-dufodewevib.pdfIn PDF document text
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/savoworijim.pdfIn PDF document text
    • http://vash-fasad.live/36773822706ufnfi.pdfIn PDF document text
    • http://pristav.pro/free_games_dx_ball_5frlsg.pdfIn PDF document text
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/3bf9a06479dd026.pdfIn PDF document text
    • http://fruct.space/dugakemeviguximibozume9c1qu.pdfIn PDF document text
    • http://podarokinsta.site/peaky_blinders_season_1_kickasspwa9h.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/feziwawufamozimeleduqziib.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/joterige/camila_cabello_shawn_mendes_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/cleopatra_movie_2014_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/sejomupolozusoregozona.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_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 5412 bytes
SHA-256: f297c24555a43f863047e221e68bd0bf6faf5f45680089a7dc1b1271c61fe620
font_01_sfnt_off000106ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 10344 bytes
SHA-256: f09d7692d1421bdf1041c82be3fcdf4b1edb71b52dc168b3b4e1c73a210f282a

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