Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff1d01409b80b5e…

MALICIOUS

PDF

91.1 KB Created: 2021-09-11 19:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 537242100882d0e7899eec3efa3e1220 SHA-1: ffe3ce99d25ad0a01406852fa0b5a1e719a519bb SHA-256: 3ff1d01409b80b5eed803feb707cb9f52842770392e3edc19b26bf63e756678e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URLs, suggesting it is designed to redirect users to potentially harmful sites or download further payloads. The presence of embedded JS and external URIs points towards an attack pattern involving user interaction to trigger malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=hack+mod+call+of+duty+mobile PDF link annotation
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/27991017101.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/simigamofegulafurir.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161362f6f568fa---89651210627.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/67527055660.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/wubixinanuwujob.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/dexikalukewapilivefap.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/97731721809.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/vibisekuzumonemuwu.pdfIn PDF document text
    • http://debten.net/UserFiles/File/dikedo.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/xubujun.pdfIn PDF document text
    • https://izr.fr/files/63135817311.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/16557618978.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16139864129122---9329295583.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/boxesuv.pdfIn PDF document text
    • http://rjt1.org/upload/files/80427095782.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/08/91222264516.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/wefivirabuwa.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/54190177124.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/67643114721.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/88629193451.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/delagulibutop.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_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001125e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125E 10700 bytes
SHA-256: b3286e9a8e738ebd70595076bf95f4b2b49eb411ff048533ac4da88f15f7b27d
font_02_sfnt_off00012af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF8 20092 bytes
SHA-256: f204e2a4a0d620a8f0f39f618dce96fec2ce5c1b4413008eef4e5ab8e6992557

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