Malicious PDF — malware analysis report

Static analysis result for SHA-256 338d989cdf686434…

MALICIOUS

PDF

81.2 KB Created: 2021-06-07 05:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 00e0bd3b19edce2441874972b1328db6 SHA-1: 6a6734c43151f3acdb0a3a43e7633fd16957ace9 SHA-256: 338d989cdf6864346b97967e77d0c90f2055a6f651eb6dfd81b01fee1e725697
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary external URI pointing to 'irlanc.ru'. Heuristics indicate this PDF is a link farm on disposable hosting, designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/pbw?utm_term=physics+wallah+class+11+notes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480756/normal_6025964f258f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_603cb490be35c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369179/normal_60084762982b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453575/normal_605ef912849a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_606ae9b3e3774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_606198f101315.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405929/normal_5ffc2dedacbe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_60b97de96aee6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426280/normal_5fc97b5f05a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474752/normal_60634f62d232d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_60240b4b2ed11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_60697a147a98f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144472476/wedagukekowe.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/w/file/fetch/144677520/pesakogisuzawefimeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd376b5-ae14-4898-b266-2c33bfdbc61b/zedotesotaxag.pdfIn PDF document text
    • http://daridameku.pbworks.com/w/file/fetch/144637950/how_to_see_starlink_satellites_in_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f7e844-ae1f-4d0a-bba1-333b76ef3833/sabofut.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144441351/boards_and_beyond_step_2_reddit.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/how_to_put_logitech_k520_keyboard_in_pairing_mode.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/w/file/fetch/144445323/revuzudusi.pdfIn PDF document text
    • http://zapibibilubo.pbworks.com/f/golod.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144686811/lobalegofujofal.pdfIn PDF document text
    • http://juvudibip.pbworks.com/w/file/fetch/144582849/how_to_amazon_carding.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/7._snf_ingilizce_ders_kitab_trke_evirisi_sayfa_78.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 5392 bytes
SHA-256: 421d9920f17f91aa45ff53e5445b0c48eb83b36b3351c9d833f070e820fea8d8
font_01_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 11384 bytes
SHA-256: 865e9acc97a2a3a5cb0ebea8e3876c2e02b132573e538760aaed91d8e8b6d1ac
font_02_sfnt_off0001222b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222B 16080 bytes
SHA-256: d274114b7e419afd615f65cf39f6f637e1c0463a40081f2adcf7b2a1c02d9523