Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f516ef7420ded0…

MALICIOUS

PDF

77.8 KB Created: 2021-02-24 07:26:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 01a8ad3b9f3ca482b5003bf40cedf121 SHA-1: d2f6d504cb0f0b04fa59418c129bef825c521a0a SHA-256: 15f516ef7420ded0f02768c3a244582de564e5d37639902de9048ddad71e37ee
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable or suspicious domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the 'link farm' heuristic point towards an attempt to direct users to malicious content.

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://maypoin.ru/strik?utm_term=basketball+shooting+workout+pdf PDF link annotation
    • https://kepefiporewe.weebly.com/uploads/1/3/4/7/134704647/jivagu.pdfIn PDF document text
    • https://kogejuxo.weebly.com/uploads/1/3/1/6/131606118/52d076.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/ghjfhi6/34497238302.pdfIn PDF document text
    • http://lazadacostumercenter.com/java_collections_framework_cheat_sheetqtfap.pdfIn PDF document text
    • http://fabermanufacture.ru/new_notice_and_email_format_icsem9okn.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/maxixapojapadevu6s9qu.pdfIn PDF document text
    • http://khanapoorti.com/maytag_front_load_washer_diagnostic_codesc3fii.pdfIn PDF document text
    • https://padipemoton.weebly.com/uploads/1/3/0/7/130739419/nireramup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449183/normal_5ffeb6e017e18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449783/normal_5fdcdf25d38e9.pdfIn PDF document text
    • https://fumasidabufip.weebly.com/uploads/1/3/0/7/130775820/zidiretixoj-kotifukogu-bazekedoputude.pdfIn PDF document text
    • http://eroganoficial.site/813777831712ca6s.pdfIn PDF document text
    • http://bioforcecolumbia.site/vibukomalalerevipasedx6fu.pdfIn PDF document text
    • http://boothattendant.com/30903013959isgf4.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/j2idhfA/pepar.pdfIn PDF document text
    • https://cdn.sqhk.co/takodabu/gfGn4jg/prehistoria_etapas_fechas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewoxorewozox.rf.gd/kobajavuta.pdfIn PDF document text
    • http://fopekexu.epizy.com/features_of_apocalyptic_literature.pdfIn PDF document text
    • http://wigamewekafon.rf.gd/5427950679.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_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 5648 bytes
SHA-256: 7b2a10c5569e03807cb5c7e68fa16b2796f4025dbba5eff10c40db23a018805a
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 10236 bytes
SHA-256: a941359187470250d5277cc8383016d393479142f6dda69602c62fad8784e5f5

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