Malicious PDF — malware analysis report

Static analysis result for SHA-256 8636866f97030af6…

MALICIOUS

PDF

74.8 KB Created: 2021-04-03 23:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 404243be823dece185f6f10440e5b8af SHA-1: 4e87312546538fbfc24faee32b9508e7c1ce3ba0 SHA-256: 8636866f97030af63a4043f75cafbec3ac3c07c66b2c01ff2f571715b0e401ca
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious content. The presence of external URIs and a link farm heuristic points to an attempt to redirect users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=gracie+barra+fundamentals+curriculum+dvd PDF link annotation
    • https://cdn.sqhk.co/wapadofiwe/hgIhdif/wakunikifobi.pdfIn PDF document text
    • https://cdn.sqhk.co/gudupiziv/ejcjeid/taxafaj.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/iiBheif/best_ringtones_for_galaxy_s7_edge.pdfIn PDF document text
    • https://molavose.weebly.com/uploads/1/3/5/3/135350427/fb956a597125b8e.pdfIn PDF document text
    • https://cdn.sqhk.co/fubemabofof/ifYXjbr/bendy_models_dc2_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/gejjgiC/wiwalafikibeti.pdfIn PDF document text
    • http://xusetifawog.mypressonline.com/zomozoxu.pdfIn PDF document text
    • http://debuged.mywebcommunity.org/solving_quadratic_equations_word_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/jasamomedam/gfujd1r/red_ball_2_level_17.pdfIn PDF document text
    • https://cdn.sqhk.co/tajugajobib/boWygeK/fusionner_deux_fichier_en_1.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/aa184fb4d.pdfIn PDF document text
    • https://ketoleva.weebly.com/uploads/1/3/4/6/134642234/rabanisuxo_virebirixamer_nibajimekowa.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/numunenoji/15539400854.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/baravugumulurakale.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/probability_and_statistics_for_engineering_and_the_sciences_devore_9th_edition.pdfIn PDF document text
    • http://nagatesi.epizy.com/zavemokedon.pdfIn PDF document text
    • http://pilivizelonula.epizy.com/7666147919.pdfIn PDF document text
    • http://vurofanosikuga.atwebpages.com/54755243688.pdfIn PDF document text
    • http://mowelafawugek.epizy.com/pemixeretomixunitomame.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/how_to_disassemble_cast_iron_pipe_joint.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/jbl_flip_2_manuale_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/15171764090.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_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 5400 bytes
SHA-256: 13ea41a105fdd2b2e2074812411c1ba52e8b3c18c553ebd7073b4f07588b8db2
font_01_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 11024 bytes
SHA-256: 1a5a400ec39c38405a62f280f5b72d6b04a2a2d43efe3e254fc57030e21f2236

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