Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0b9866ce6290bb…

MALICIOUS

PDF

92.6 KB Created: 2021-03-27 14:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d08a6e0b74c3a9cbd81a94f9c7ef5c36 SHA-1: b2f59dea02c69c52a843c076e414c78ea57ee4c9 SHA-256: cb0b9866ce6290bb277ae81b22564d15cb63e9ea1a27a8866cdabaa44003e48c
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically pointing to a suspicious domain 'midufefew.ru' and containing a 'utm_term' parameter suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/123?utm_term=brave+heart+digimon+piano+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422876/normal_6049488d5e494.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/a8eMqJC/40596577654.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/mukifepub.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/how_to_turn_on_furnace_pilot_light.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/hifjbxu/bukewizer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370273/normal_5fc82724e2245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480904/normal_600ebe91cca60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483839/normal_6044d6714691b.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/9hcibXi/86484105377.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/1hgshid/suvig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461780/normal_5fe1d1ff23da7.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/81724109788.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://telosizaba.onlinewebshop.net/serta_adjustable_bed_warranty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdafc371-4b62-412c-a539-107ae7650b2e/firusaxolegila.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/manik_bengali_movie_video_songs_free.pdfIn PDF document text
    • http://dirazonun.myartsonline.com/nirozulu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/31722023256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77270039-b0da-4468-993f-0b0a2ccb057e/68167388423.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/how_to_install_arctic_king_portable_air_conditioner.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 11568 bytes
SHA-256: 159b8f9b7e1c2e2d3d5cff47caf9ac0e9f1d408bbb9afd7872547a49535f324e
font_01_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 5444 bytes
SHA-256: 48202aad55885d39087c99e2d5488997788e40531e5dc4f5727a5bc0b805af40
font_02_sfnt_off00011f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F87 18372 bytes
SHA-256: 6dc9012b0475ba2cfc6a3a76a815e5ae3a3136dc5cbb4702b59a5eecc4c87f37
font_03_sfnt_off00015697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15697 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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