Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98025215da13a73…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 22:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b20f45c9573a0bea5464fa7cc3a3ef2d SHA-1: a87f36d90614274aa344fa6d6b0c94cc7e0ba2e5 SHA-256: f98025215da13a737c621b88b0f3f1375777c39fa7d0115de098fd4b6ea366a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to disposable hosting and are likely used for phishing or to distribute further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=fantasy+life+apk PDF link annotation
    • http://amphorabeautyclub.com/campannas/file/95568935224.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/01550a4874869baa4ff2e40ea17eada4/73761794758.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-19/20210919200845394920.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/duvuro.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/55474244396.pdfIn PDF document text
    • http://underbutter.cz/download/foto/kabitebetasin.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/wupisulutedikuj.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/23337967034.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/kuzipetatug.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/duxonomulapududusazawuwej.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/40841018618.pdfIn PDF document text
    • http://iviltra.lt/images/files/61088958303.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/15686763802.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/bebuwekajifa.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/puzuvagadagusebikilodubu.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210920_8B508DA63EF1CF97.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/tepivekalomano.pdfIn PDF document text
    • http://trevorhannant.com/26547536650.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145740b85c8f---36115990808.pdfIn PDF document text
    • https://cmoretv.com/userfiles/55223743902.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/zituwupipakebokizuz.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/54860856286.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/18197171656.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/78353263257.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/xugemavuwamasu.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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 10316 bytes
SHA-256: a01af2d576ed3f620cb6c943674f6c1d1bc4672a2ea51c817d94144958e4d4d2
font_01_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 18484 bytes
SHA-256: 7cedd3b00150ceb2c642469f854a57c23573d5faf5179fe3812b556bb4ff7234
font_02_sfnt_off000121b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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