Malicious PDF — malware analysis report

Static analysis result for SHA-256 635d0dd578a3e66c…

MALICIOUS

PDF

83.3 KB Created: 2021-02-26 12:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6bdcd9839fa6253c7ede9b6074031cbe SHA-1: 5e6f198bb18a7f8ab8274303eee6b2c04ba399ef SHA-256: 635d0dd578a3e66c42906faa44fcedc88a0100c4c73a25ae6d9aece9328e6d19
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic identified it as a link farm on disposable hosting, with 30 links pointing to 19 distinct hosts. The embedded URLs suggest the document is designed to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://xezojetit.ru/wb?keyword=diablo%203%20season%2022%20builds%20rhykker PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369900/normal_5ff90b6bd0539.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/9649697.pdfIn PDF document text
    • http://xelapelumu.iblogger.org/bikipawoveb.pdfIn PDF document text
    • http://feedbacrnz.space/dokerotoxebelabujewunl4v9i.pdfIn PDF document text
    • http://govaxesis.iblogger.org/chauvet_freedom_par_quad_5_manual.pdfIn PDF document text
    • https://xafijedalab.weebly.com/uploads/1/3/0/7/130775792/zupafemaxu-favepaj-jopagaxi-mokizegamobowex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_602373a1934ee.pdfIn PDF document text
    • http://stnold.com/negilipawodapojohwj.pdfIn PDF document text
    • https://ratipiju.weebly.com/uploads/1/3/0/7/130740089/4632587.pdfIn PDF document text
    • http://shoop-fm.ru/laars_lite_2_pool_heater_manual505ec.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/jjuIheV/pawewubiwul.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/l4HhhcG/frogger_ps1_cheats_unlimited_time.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/date_linux_format_yyyymmdd.pdfIn PDF document text
    • https://keboxineb.weebly.com/uploads/1/3/0/9/130969034/6858468.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371025/normal_6005dd6a68846.pdfIn PDF document text
    • http://wiinorama.space/87889867585mvx60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383160/normal_5ff564632be27.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/ihbaJjy/21721464685.pdfIn PDF document text
    • http://haustova.com/best_buy_tv_cyber_monday_20192lj72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fejusadifidexi.epizy.com/december_2018_act_answers.pdfIn PDF document text
    • http://xabuvale.epizy.com/14560803474.pdfIn PDF document text
    • http://bubezowi.epizy.com/54525279715.pdfIn PDF document text
    • http://jigigapapidafe.epizy.com/53530177931.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_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 5512 bytes
SHA-256: 434308abefb651a80a064d970207d5d3e8302aa5d1561cb55c0bc04f37ed4181
font_01_sfnt_off0001181f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181F 11672 bytes
SHA-256: c2a20b4bd72225a8760aae3b86b9b8876eb97672f07c24fd57d229e4f3decef3

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