Malicious PDF — malware analysis report

Static analysis result for SHA-256 a919b12eef4b2347…

MALICIOUS

PDF

76.0 KB Created: 2021-03-16 14:59:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 95bb2a379e79471f42cbc81322c104a3 SHA-1: a4814bca9f378ac4d4744e3fff0435f31074ec61 SHA-256: a919b12eef4b23473d7b03ccf5ce4d9da46ce863e04fe9673198c8403e3e4de3
134 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic indicates it functions as a link farm. The presence of invoice-related language suggests a lure to trick users into clicking these links, which likely serve as a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/award?keyword=bookkeeping+pdf+tutorial PDF link annotation
    • http://lnstagramverifiedbadge-media.com/mixing_and_mastering_in_fl_studio_12am8xl.pdfIn PDF document text
    • http://flylovel.com/tubepodavipixwpvw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425726/normal_5fed13850f5d3.pdfIn PDF document text
    • http://xawikeroteguvu.iblogger.org/kikefeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418583/normal_60416a7d82884.pdfIn PDF document text
    • http://gomunawuwox.22web.org/baxumorerejemuwupeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403274/normal_5fe251a186543.pdfIn PDF document text
    • https://cdn.sqhk.co/jalafimimodo/dojjidK/promodescuentos_ofertas_mexico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479214/normal_604d105513a15.pdfIn PDF document text
    • http://tufataf.22web.org/agrobacterium_tumefaciens_transformation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fca5c6f35f05.pdfIn PDF document text
    • http://bofesota.66ghz.com/artificial_intelligence_norvig.pdfIn PDF document text
    • http://snapchat-alert.com/taal_mp3_free_downloadt80j9.pdfIn PDF document text
    • http://vclean-sale.shop/10888876058i9a48.pdfIn PDF document text
    • http://cleaner360.shop/how_much_does_it_cost_to_replace_a_lg_tv_screen1locw.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/jegchgb/bugakaweli.pdfIn PDF document text
    • https://cdn.sqhk.co/novimabe/d49ieib/pifupisamafevurotepinamew.pdfIn PDF document text
    • http://ionatr.fun/97216843036jym75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gariravufur.epizy.com/the_lion_the_witch_and_the_wardrobe_original_movie.pdfIn PDF document text
    • http://sevuvev.epizy.com/savalowerak.pdfIn PDF document text
    • http://fudodub.epizy.com/aha_cardiopulmonary_resuscitation_guidelines.pdfIn PDF document text
    • http://muvebabivixa.rf.gd/latest_edition_of_barrons_sat_physics.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_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 5144 bytes
SHA-256: 55301ce25dffd1f3010453176df636a46b73eb8930522cd5c89cb600099da4ce
font_01_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 10772 bytes
SHA-256: e86d6a9cdad1af7df760a091f8b89183e0051a176de4ab02554abf0d6e685a87

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