Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe85a54953e267e…

MALICIOUS

PDF

76.7 KB Created: 2021-03-31 06:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 258883da0fcab85fc1e4eba09990e654 SHA-1: c7a21af5f5e7d15d1bf062722fced69936f49828 SHA-256: cbe85a54953e267e844169a6b1f894e86d6d7d9b3321cd10b699423f7d07e4bb
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=secondary+analysis+of+survey+data+pdf PDF link annotation
    • http://gosepakaf.getenjoyment.net/48059727871.pdfIn PDF document text
    • https://riwominejakubik.weebly.com/uploads/1/3/4/5/134598273/vovisefef.pdfIn PDF document text
    • http://vegoletox.medianewsonline.com/automated_trading_with_r_conlan.pdfIn PDF document text
    • http://vomidujoma.scienceontheweb.net/little_red_riding_hood_short_story_summary.pdfIn PDF document text
    • http://ionatr.space/82804156354mf9xv.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/cisco_ccna_book.pdfIn PDF document text
    • https://kadukutinebi.weebly.com/uploads/1/3/4/7/134747046/gowugubakizevopaget.pdfIn PDF document text
    • http://skidki-day.site/nemelurexusazulaub6f.pdfIn PDF document text
    • http://tosety.xyz/anisette_font_freej3uzc.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/barfu_am_klavier_piano_sheet_music.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/lipupovagirugekorefino.pdfIn PDF document text
    • https://zefisuket.weebly.com/uploads/1/3/4/8/134868467/c1a9fa7abbc0bfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likutolejit.onlinewebshop.net/esl_speaking_activities_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/90089695211.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/wu_tang_documentary_showtime.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_e4c2d2c8af67414384fd685644dbd672.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/2122104399.pdfIn PDF document text
    • https://9301df3d-c689-496c-811c-0581e5fecd74.filesusr.com/ugd/f62067_de492acd52f74e19bc753d93285310b5.pdf?index=trueIn 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_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 5416 bytes
SHA-256: 17657af92718bfef7f1695cd91f77fc8e3522ba6501407f5de7008d214d0924b
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 10740 bytes
SHA-256: 9b16365a7c8d2ce60594a32266cf8757b0d781fdd3d462f81443e5b6a6393992

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