Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb042d9bb1b57383…

MALICIOUS

PDF

75.4 KB Created: 2021-09-18 11:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0eeba6547aec1892a74330a057a8bacd SHA-1: 1ed8e35f6c7ca97aba8ca83252cf2cdd9b344139 SHA-256: fb042d9bb1b57383aeb0f04915d29dcc570c403485914ca25c297a2c3a7adff0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://nedirajtebosnu.net/userfiles/file/tapepotibakefu.pdf In PDF document text
    • http://esejsc.com/upload/files/80561459209.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/kesetojowapujopurup.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/11566926095.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/limejo.pdfIn PDF document text
    • http://bronia.org/userfiles/file/98525530062.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/58615387399.pdfIn PDF document text
    • http://atek-ent.com/upload/file/vowemov.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/lobenawonunezuferavujabe.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210914015643.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/36241527902.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/6874332863.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/48623184781.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/33849372588.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/49194351901.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/12787358032.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459d4c8da2f---bugoroz.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/fawamagapelixitedutenone.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/wikubi.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/rivolebonesuve.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/21145241999.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/zogikosudip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=enable+usb+debugging+via+twrpPDF link annotation
    • 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_off0000c36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 10824 bytes
SHA-256: 1b678726ad42ebb7a8b368f406fa9d5827f86bcb51a34650be1afa208f261dbf
font_02_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 16852 bytes
SHA-256: 1e0461928183c82936548891d5e5b9f65b466547da6aa038ad582bbbc6e141c5

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