Malicious PDF — malware analysis report

Static analysis result for SHA-256 924d41d80483fa0e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 07:36:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 65659dbad7e57e4890f770528cc66dbc SHA-1: 117934b6ab23778a69203519a53fb44bccdc5994 SHA-256: 924d41d80483fa0e90516b6e62d700fe275c3dd07efcca80fd3303217d04dd5e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'passive voice worksheet printable', which is likely a pretext to drive users to the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/123?utm_term=passive+voice+worksheet+printable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421460/normal_60253102c7346.pdfIn PDF document text
    • http://sun-italy.space/flysky_fs_i6_setup_for_planekhqpj.pdfIn PDF document text
    • http://clientbluebadge.com/2008_physics_greeu2kv.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/hbhagj3/gewutitikidadana.pdfIn PDF document text
    • https://cdn.sqhk.co/vekosozob/SjiijbZ/sojogij.pdfIn PDF document text
    • http://creditscorehelp.info/eclipse_go_to_bookmark_shortcute55fa.pdfIn PDF document text
    • http://carluxepaint.site/48599057444wmkgi.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/icd_10_code_for_urinary_tract_infection_due_to_proteus_mirabilis0ocv5.pdfIn PDF document text
    • http://tonerinkstore.com/57000008708pj4fx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_60533ace80615.pdfIn PDF document text
    • http://xeratigike.medianewsonline.com/durenalinidenusat.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/duxujifulasuwinula.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/Zxpgg4q/pejofogivejuwonixexuk.pdfIn PDF document text
    • http://geekcods.com/kuxerazojespj3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5ff225ff8e274.pdfIn PDF document text
    • http://vash-komfort5.ru/nezugopidewuqjaee.pdfIn PDF document text
    • http://cashthe.ru/roxolalexegunatona9xww1.pdfIn PDF document text
    • http://natnat.fun/xebifuvufonigulutozn9rmp.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/jDig4gh/88073260647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_600ddb22ced43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogivuwe.onlinewebshop.net/realism_and_naturalism_in_english_literature.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_56aca26baab4448e912bb67570fd62d3.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_519af23264b44e7f98d0dc16e10bcc6a.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_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 5376 bytes
SHA-256: 1b55d5c387725cdb20b7e6b3b5b85af02c4119a302360c976aa8924ad9bac7d7
font_01_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 10704 bytes
SHA-256: ba10dd74fdce58f4ba114700098be3c060a44018a41236b5d67005ff7c1ee579

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