Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cba59704fa6057…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 00:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9306013a19783a83e8e9cbf2fcbccd1e SHA-1: 117eabd6a5c4d86399128defb35502abcdecb862 SHA-256: 21cba59704fa605786a5668a76a79cdde02100ccec07d4a761039f17c6a4f986
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 identified as a link farm hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The presence of embedded URLs suggests the document's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=play+store+app+install+in+sd+card PDF link annotation
    • https://confeccionesruiz.cl/UserFiles/File/97243949144.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/kovosadujojiwobaketo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc6cc5370---59898630727.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/68095679024.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/31223988926.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/8230500838.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/74327592550.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/76811579996.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/sudimomumezo.pdfIn PDF document text
    • https://digicpictures.com/downloads/24074778689.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/58509682916.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/wuguzurivolafuz.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/lutipa.pdfIn PDF document text
    • https://stormester.no/files/file/28884436771.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/keforivax.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/pibutube.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/98441184131.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/85498938103.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210905000610.pdfIn PDF document text
    • http://houselandia.ru/files/30143678001.pdfIn PDF document text
    • http://pi-consulting.ch/download/45303710052.pdfIn PDF document text
    • http://adice-area.com/pictures/files/xapesixesefas.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/52088040271.pdfIn PDF document text
    • https://senfina.top/uploads/files/wuzanuvezekolu.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_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 10624 bytes
SHA-256: 2e565fc7161ae7804eef6cd31e5b80c25158c83be0009bc9661167c9e220a211
font_02_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 17680 bytes
SHA-256: ec8b176d15dd6bba30645e749cd04a32b8d64c835c6592ff74124cb8319cbc10

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