Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b0cbdc42abe868…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 05:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4e1d8e3019798cad1f230345677b5aad SHA-1: 95b90ef3195123a6fd553962bbf459d27ec7551e SHA-256: a4b0cbdc42abe86823cab89c399e10530749cbb174e4c09950ee5e5f4b2137a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the presence of multiple external URLs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=once+upon+a+time+in+the+west+full+movie PDF link annotation
    • http://tobn56.com/UpFiles/file/59822707503.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/zegetosobuvazixewubigofo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379c792eaa4---zekujatuvesomufewedola.pdfIn PDF document text
    • http://hanauhrova.cz/files/rewuni.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/34485924468.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/15294480694.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/79798223740.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467c6ad3cab---pagaziru.pdfIn PDF document text
    • http://capri.lt/userfiles/files/siwiworozarazaxogofefabe.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-8/20210908075358544541.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/vofezejatakitejedakujade.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/89283288094.pdfIn PDF document text
    • http://jarosi.hu/files/file/94323023629.pdfIn PDF document text
    • http://robbes.nl/media/files/41637468699.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/20258519572.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/wowemotawuwitojem.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/66747671840.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/35113300461.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/sulesutijewar.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/dozegavopegunaxopidox.pdfIn PDF document text
    • https://pokereshop.cz/data/file/23900552666.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/86426809954.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/24317149444.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_off0000b8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 10920 bytes
SHA-256: 34d8453142e4e21dfe19a3f4514064ab9357a4b7f081f50f6482d1d780dfec76
font_02_sfnt_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 16564 bytes
SHA-256: b62b31aae65cc23c4a33f7d964ca10cd67741ea0a4ee22bad0956d7dd5a3c0a3

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