Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f186fcb53419a4…

MALICIOUS

PDF

78.8 KB Created: 2021-03-26 04:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5e31ac84fd08f2fa5a430a5b6f3fd6d4 SHA-1: a211d83fcecff548e6394303b91e5115fbc15dcb SHA-256: a8f186fcb53419a42758a01ad5f57a2665ae12a7edc56b992f0ce055c20b3a6f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a primary focus on a URL disguised as a free online course. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=learn+korean+online+free+course PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478134/normal_603d25ef3f2cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_603e7180a93db.pdfIn PDF document text
    • http://dedevolopi.iblogger.org/what_is_the_tone_of_the_poem_if_we_must_die.pdfIn PDF document text
    • https://xewaxamuroz.weebly.com/uploads/1/3/4/5/134529724/xitubetuzuva.pdfIn PDF document text
    • http://linunewilut.mywebcommunity.org/sonic_archie_comics.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/92227509657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_60596229319e0.pdfIn PDF document text
    • http://visunuduxat.mypressonline.com/accounting_standards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402956/normal_5fca623a65410.pdfIn PDF document text
    • http://gogeduripa.iblogger.org/best_return_of_the_jedi_quotes.pdfIn PDF document text
    • https://gumiworawogulaf.weebly.com/uploads/1/3/4/3/134356348/bamavesufevonenome.pdfIn PDF document text
    • http://wofeboz.66ghz.com/bodybuilding_exercises_at_home_video_free.pdfIn PDF document text
    • http://xirixakexove.iblogger.org/superannuation_fund_performance_australia.pdfIn PDF document text
    • https://fomimixa.weebly.com/uploads/1/3/4/7/134775862/lafipuberuzure-kipovalexaw-dativokimut-mazuf.pdfIn PDF document text
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/583f00e218d0310.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449615/normal_5ffb583911da3.pdfIn PDF document text
    • https://daseguvemorog.weebly.com/uploads/1/3/4/3/134357845/xodirupomaput.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383147/normal_5ffdcb1242ca4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wijijatalil.epizy.com/application_support_knowledge_transfer_template.pdfIn PDF document text
    • http://xabasib.rf.gd/lurik.pdfIn PDF document text
    • http://pusupap.rf.gd/wevojepinekuse.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 4680 bytes
SHA-256: d6abe31425944e25ca0d6d9d5f7c4ea11a2a15863b17e61d0f21421accead174
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 10704 bytes
SHA-256: 073d7dc186389afcd073382b6302751b4cbf4a18f92b026037950153db011390
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

Open this report in the interactive analyzer, or submit your own file for analysis.