Malicious PDF — malware analysis report

Static analysis result for SHA-256 7095125bc9438960…

MALICIOUS

PDF

80.6 KB Created: 2021-03-24 15:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 670829c7bfb952996f5fdaf8e880c597 SHA-1: abe99c260176f3b55873a83cb4171deb3636c136 SHA-256: 7095125bc943896023c7ac786349cf03fe65ed423b1accd16f75477e01de3d10
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'resalured.ru' which is associated with phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting. The document body, though heavily obfuscated, suggests a lure related to an 'assistant engineer exam syllabus', a common tactic for phishing campaigns.

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://resalured.ru/award?keyword=kseb+assistant+engineer+exam+syllabus+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372702/normal_5febcdf1b0e1e.pdfIn PDF document text
    • http://good-production20.site/the_story_of_edgar_sawtelle_themesmdb9z.pdfIn PDF document text
    • https://jotovaxawunujej.weebly.com/uploads/1/3/1/8/131856347/1234924.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokoze/Ijfigii/rerexowabivokugoxoxiwuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_6048e021d679b.pdfIn PDF document text
    • https://wikusujuvi.weebly.com/uploads/1/3/1/4/131406665/7e7aea7eeebee57.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/QickI9S/midofuziwu.pdfIn PDF document text
    • http://linza.media/thule_caravan_bike_rack_fitting_instructionsd3h4y.pdfIn PDF document text
    • https://bidegibi.weebly.com/uploads/1/3/4/4/134476665/1a53e576dbd.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/aYhfjdw/supercars_for_sale_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_600bc4999d162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425214/normal_6020a59996855.pdfIn PDF document text
    • http://antonioit.space/bihar_board_admit_card_2016sk4of.pdfIn PDF document text
    • http://inmyshtangen.xyz/minn_kota_powerdrive_70_w_i-pilot__bluetooth_70_lbs._thrust_54_shaftedzgo.pdfIn PDF document text
    • https://xidokuwu.weebly.com/uploads/1/3/1/4/131453793/118b76f51181.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415525/normal_5fc7d64c86984.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/bible_commentary_on_the_book_of_genesis.pdfIn PDF document text
    • http://timinome.getenjoyment.net/theological_foundation_of_christian_education.pdfIn PDF document text
    • http://natural-shop.info/contractions_worksheet_grade_6b596u.pdfIn PDF document text
    • https://kobivepetere.weebly.com/uploads/1/3/1/8/131871499/29738fc774f.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://sudexixurijaxoz.atwebpages.com/sisenaxenabitolukewu.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_bc75976c2aff48469c7d59fa974943a3.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_5137686b3b864a8aad4185f0ac5be678.pdf?index=trueIn PDF document text
    • http://bobixupeto.myartsonline.com/que_es_la_administracion_publica_en_mexico.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_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 5412 bytes
SHA-256: 5490ad30abae9d66cc0c6e9f46f6416a897a2a6b8254036a32de1a220376ea63
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 10472 bytes
SHA-256: 3e3149f1fb11eb6579656ea743744606563c30aac993c41637e78152fa54a55a
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3