Malicious PDF — malware analysis report

Static analysis result for SHA-256 5384c40fbd087a39…

MALICIOUS

PDF

77.5 KB Created: 2021-09-09 06:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4a9a343874f9dce9f950c2c79d5e7742 SHA-1: 862443a4fa66df042ba1ac1d48b76b9bf04a84a1 SHA-256: 5384c40fbd087a396807438d832e3ae64ff43bb3a4c3dd858bf51493496f695b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=best+website+for+keywords+search PDF link annotation
    • http://fundacjahfg.pl/upload/file/bezowebukuxadeg.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/xefizikakajeril.pdfIn PDF document text
    • https://ekransamara.ru/files/3327709409.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/zufipowawur.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/nazagavaputumobazuz.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/kuvuwogitedopigumotegu.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/vakixuwawimorepirawaza.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/13779048094.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/wirenog.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/13723421690.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/sivapazexita.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/46609556691.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/vidilobakedagafovasabilud.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902110830.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/kokefejegeza.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/tefakatokup.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109040506415818.pdfIn PDF document text
    • http://www.bash.cl/media/file/xoxemufupipazagale.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/munew.pdfIn PDF document text
    • http://agilesolutions.in/uploads/gefotozumisavojekad.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/dalesidurukow.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/39478444627.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161375412af1fd---2115651271.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/dazonu.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109020906388278.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_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 17100 bytes
SHA-256: 93d0c7d8d75f4df484e57dedf00c6a09565a69802aa0e38c5c984260ef9b8187
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 10908 bytes
SHA-256: bb1bc13291cb2c0ad56422d4ad5d591610e708a7596ffa0defc77c03e8592fc9
font_02_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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