Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed26584642e7da17…

MALICIOUS

PDF

87.6 KB Created: 2021-03-24 07:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca7bf12bcd7130af6f06d58f81473bb7 SHA-1: cea81936e355a1ed1e4e48949773fa92141a8b2e SHA-256: ed26584642e7da176583e086d24646f8bc0dc8371bd22d77fa536c5de0eac403
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 hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document body and embedded URLs pointing towards a lure related to 'bodybuilding home workout apk'. The presence of numerous external links, including one to 'jumiwimov.ru', indicates the primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 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://jumiwimov.ru/123?utm_term=bodybuilding+home+workout+apk
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/1896262.pdf
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/4649306.pdf
    • https://cdn.sqhk.co/wagomito/e5xjheX/70406228950.pdf
    • http://tewovenaj.22web.org/tesogosube.pdf
    • https://gusoretudofuriv.weebly.com/uploads/1/3/4/8/134885571/6193762.pdf
    • https://gulapizebulo.weebly.com/uploads/1/3/1/0/131070336/pijaresusovunem-neruzubagurixub.pdf
    • https://cdn.sqhk.co/pojuwudedi/dPpijgf/mefosekawo.pdf
    • https://cdn.sqhk.co/rozopebak/gghhDhg/kinotinuxokowiru.pdf
    • https://cdn.sqhk.co/pagupuxu/hxDVExx/46115268504.pdf
    • https://nifatukipukixe.weebly.com/uploads/1/3/1/3/131398430/5043537.pdf
    • https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/3738667.pdf
    • https://vawemizowuwokuv.weebly.com/uploads/1/3/0/7/130776252/8681995.pdf
    • https://cdn.sqhk.co/simumufij/ijigjqp/myriad_pro_regular_google_font.pdf
    • https://boniwivo.weebly.com/uploads/1/3/2/6/132683051/d10b1d9.pdf
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/fd5b4f9d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ginisanekuxowo.epizy.com/tell_me_about_yourself_in_interview_answers.pdf
    • http://bitesokilok.epizy.com/update_mysql_database_php_form.pdf
    • http://kaguzawavor.epizy.com/sons_and_lovers_character_analysis.pdf
    • http://zuvujivir.rf.gd/38907870016.pdf
    • http://tonataf.epizy.com/65990948956.pdf
    • http://xupudajiwozov.epizy.com/best_alarm_ringtone_free.pdf
    • http://siginokubazepu.epizy.com/11443172118.pdf
    • http://folujas.epizy.com/kifopanu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001180b.bin
aace76da0f31fc619aae9cbc03b2c5312897d357233946f773532fa94a3e48a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 5644 bytes
font_01_sfnt_off00012b25.bin
dbe9324433adfb0e86d0f9d1c512464aad7cf6e4beccab4655ee50c9213ab6fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B25 11112 bytes

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