Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29b15d474e340e2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 02:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73fa0cebcbc8bd218d79703f01189fb8 SHA-1: 1912eb78657c2b8c92669c737fc1fbdb86e31766 SHA-256: a29b15d474e340e20191e08164cf7a49b7d134432e9d0a81fa1a303fd5d25f32
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 external URIs and is structured as a link farm, with many links pointing to disposable hosting. The presence of external URIs suggests an attempt to redirect the user to malicious websites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://garglob.ru/uplcv?utm_term=how+to+restore+a+file+on+android PDF link annotation
    • http://webinaris.biz/ckfinder/userfiles/publics/files/bodikovoniwefiwuv.pdfIn PDF document text
    • https://subded.org/userfiles/file/70942615444.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/49423460192.pdfIn PDF document text
    • https://pellevah.com/upload/files/varorigezakulumomofol.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/nalimu.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-4/20210904173714585342.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/gisajevefepoligep.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210911142052833.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4e7929b8359acb1723e7edfc0eecbebf/95985108360.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/bamewuwawogizod.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/bizaxilevumasezebopad.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/kemowumikidozofaliwe.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/dizokuwuzetewapawisiwiv.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/63463646177.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/19227208157.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/2070026055.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/xunirufupezi.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/zofoweturazejanotifejab.pdfIn PDF document text
    • http://wdnederland.nl/file/36402637532.pdfIn PDF document text
    • http://podarox.ru/public/files/81220061220.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/faserawulusuve.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/zabusixofagadi.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/xajimakim.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a28a14bf8---18426147169.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_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 17776 bytes
SHA-256: 2ff5e95b8e186ca2433124ae1bb0b493929da5ff324c2dd5afe80a92788079c4
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 10424 bytes
SHA-256: 6346d9474ecc8a7afba0da4db3e6a79be2df389c8082b766d1896a706d7ea769

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