Malicious PDF — malware analysis report

Static analysis result for SHA-256 f573c08c42337f31…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 08:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4675e2896fa10adc0c05cbc63d09fe17 SHA-1: 370cb5066a5e342c3bb5f51903ffe75dad14e3a9 SHA-256: f573c08c42337f31370784aa9cc442509bba0cfb10b0b3396781f628e03b6d80
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to distribute malicious content. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic confirms the use of multiple distinct, potentially disposable hosts for linking.

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 http://xn--hh0b97d8is16e.com/userData/board/file/jawidijotipijumofo.pdf In PDF document text
    • http://appartementslisa.it/an3_Uploads/file/13318557613.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5db434db---30323743152.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/70832027595.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/bilebujujevexadutu.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/jaxozonaranatewexusozo.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/kegatobewozugasab.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/aqpmd6rf2fqlm262edqsse66tj/xonewokogip.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/gakosuwiginiv.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/fadutubotaxux.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/53597268951.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/sopewixexisamuvodene.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/tomasatutifekuduzifuk.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/91504554860.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/venirapexisugewapeg.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/92514170053.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/2319529099.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/93358195869.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/67088209799.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/tesafik.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/16827569766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hack+version+of+subway+surfers+apkPDF 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_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 10916 bytes
SHA-256: 07b6e32b0ed35b5768964a395989a03acb0b9d91fc585714339a2a2da4436058
font_01_sfnt_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 16884 bytes
SHA-256: 8a295589fdd482ce8593eabfeb6c6a92e46b84ae4a77b77b2fd3427ac7303dc7
font_02_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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