Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd42e7fb990cbf96…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 10:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b2b44a38946253941396c7920683d600 SHA-1: 9fd75c776b3f4dbbce44678db0e9b4840d517a9f SHA-256: cd42e7fb990cbf9684e0b2f215cc0670643489a1cb3ede34dd44be695cf85360
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used for phishing or distributing further malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a link farm strategy, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://livewireeventz.com/userfiles/file/80690574796.pdf In PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/lagamorigezogo.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/momidutetosubedapugodomo.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/povosuvozadurusorulubot.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/kotabafexeditabirez.pdfIn PDF document text
    • http://holzbau-napetschnig.at/35899280370.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210902101840_f3kgac.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357aca81eb2---sasujel.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/xijopifu.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/giketirujapowopa.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/wekotedasine.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/tebudilerofivez.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/xojigesozuzegifagibixop.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9c02b0eea720c0129d172e516a595a3f/nefuwibedusewaxuseras.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/42161295211.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/66332560174.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/90224883051.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/jomon.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/leteriretuwi.pdfIn PDF document text
    • https://majubesar.org/contents/files/ganoropugidifapabuxakubo.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/60238325114.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/dabexoselisapogorelajel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=free+fire+world+series+obb+downloadPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/37211301243.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://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_off0000b950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB950 16348 bytes
SHA-256: 1e2713c86674e1fe1915d4f2f47f06eaac2573d9d32ca84b4079aa85e8c7ac9e
font_01_sfnt_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 10452 bytes
SHA-256: a28d65077490ad8dd895aac09cb490d6485bf9183984787240e111eec115dc9b
font_02_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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