Malicious PDF — malware analysis report

Static analysis result for SHA-256 05798267451b549a…

MALICIOUS

PDF

189.5 KB Created: 2021-03-23 03:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcbabc2d6b5aa5b00821e9686dbd20c9 SHA-1: 27deb5c2084b4829829a279db3e71e7023b0d0f8 SHA-256: 05798267451b549ac0ff682eb8824bca779a505680101957fddb03aa78d00a4c
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier also flagged the PDF as malicious with high confidence. The primary malicious activity appears to be redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://dafemum.ru/123?utm_term=12+bore+bandook+photo
    • http://acupofjacob.com/peavey_vypyr_vip_2_edit_softwarex25d0.pdf
    • http://bawimip.sportsontheweb.net/zisanoziruvezafogi.pdf
    • http://koxelovanalimu.getenjoyment.net/21929749137.pdf
    • http://jewlgems.com/how_to_cut_stone_paversfw5k9.pdf
    • http://sy0n.icu/25942446464zgbvw.pdf
    • http://nakotigolajeg.scienceontheweb.net/craftsman_tiller_carburetor_adjustment.pdf
    • http://jixazepo.mywebcommunity.org/causes_of_abnormal_uterine_bleeding.pdf
    • http://bonifacy.site/autotrol_water_softener_bypass_valverqv37.pdf
    • http://help-igcopyright.xyz/vekarivezujivitavuxijokuj893b.pdf
    • http://sewatumafuta.medianewsonline.com/21205425864.pdf
    • http://jawunefuda.mygamesonline.org/pathology_mcq_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nizofikunatafu.atwebpages.com/list_of_all_aircraft_types.pdf
    • http://zevusup.atwebpages.com/rufojejizosupi.pdf
    • http://fataragoreb.myartsonline.com/navexaxomopokikidowuvif.pdf
    • https://uploads.strikinglycdn.com/files/68bb87f6-b57d-4cdf-a284-9b1cf4bccb75/is_trx_effective_for_building_muscle.pdf
    • http://posikin.myartsonline.com/fabagulefifaxetoxelo.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/broadcast_receiver_in_background_android.pdf
    • https://s3.amazonaws.com/zidosozawok/xubufo.pdf
    • http://rewuwuja.onlinewebshop.net/acrobat_pro_reduce_file_size.pdf
    • https://uploads.strikinglycdn.com/files/bd6b8698-fa03-4719-98db-1f74bacacb47/linking_words_exercises_b2.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002af40.bin
aff1156758527e481d47fc8e61de4f36943d3d54bc4f0d485214029c4ab5d7f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF40 5132 bytes
font_01_sfnt_off0002c0a9.bin
bd823c9af7e57ebe217d4ca6ac950560477e34638b5734e09df898ce819306f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x2C0A9 11312 bytes