Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c8dccdf928b688…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 10:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aa2dd46101879fb62d637c567658793a SHA-1: 113e979e02d6a2ae3d1010e45f434a63b5b0e9f4 SHA-256: 48c8dccdf928b688de88b8956e818ece59bd06e5e4812ef461b90b1b528c563d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, with one specific URL suggesting a lure related to mobile tracking. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=how+to+use+mobile+tracker+for+android PDF link annotation
    • http://kwiatmetal.pl/userfiles/file/gerotofev.pdfIn PDF document text
    • http://feg.vn/uploads/files/nolomatutifutaxulirixiv.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161369ba697c95---34731585692.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/fisaguduj.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/rajuvusowimifatoxos.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/88662983174.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/putifotozulanefiluv.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/28481900816.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/36504013223.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/95073776961.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/27948894816.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210904092700.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/xabixi.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/12227450504.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/zuvibodatavuloz.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wipilagezigeko.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2fa73b0e8---bifajoxuzevojowipaduvid.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/geparupojavubab.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/34454618980.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/mujuninupojadu.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/favufisavazinitolitupava.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/gonop.pdfIn PDF document text
    • http://budropol.de/Upload/file/33997248025.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/sojulagukemat.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_off0000bd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 16356 bytes
SHA-256: e78b2fd0f24cf108c426c6e2def0c9f37422712a0cf64ae4d2ef7fb8c6940620
font_02_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 11048 bytes
SHA-256: 756042fbf8d01e89a7ac120cc6c7c452360b68ca1d498995f46aa8b125bd351a

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