Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ee03470b588991…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 01:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac20d1b6b289646ecb1ec42e0dd0a340 SHA-1: 3fb3a4ddb8426c081d2cfc0510363d18add28261 SHA-256: c3ee03470b588991184854067c65ea030b91b06f446fe44eb2d941672b3e5146
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and a large number of embedded URIs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of JavaScript indicates an attempt to execute code, likely to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613418ab0925f---boxukirurim.pdf In PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/nifazarifufagepafikuwut.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161394264827a0---zezarazopitana.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/28606901301.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/31023551342.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/tabolelosumovopaw.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210902050445.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/41535310993.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/2571233776.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/38536464611.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/lebewarufimaxisanezomafo.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210905045521.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/96056817514.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/liputobaliki.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/99724461868.pdfIn PDF document text
    • http://kleiberit.ru/files/file/63653545920.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/bodubowanaxowawi.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/99090862532.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210913161142_u00ihh.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/dakanopapewak.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/6724021515.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210904_140039.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/4848838132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=where+can+i+watch+spider+manPDF 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_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 17464 bytes
SHA-256: a7d6a9eaacfcec3d87285c0d9b53e7860428c52a1ae28b8324a0ae41af1d6091
font_01_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 10692 bytes
SHA-256: 5cf0acc22131561090f38ccb41f55788c760faa37d717f30240242908d12b52f
font_02_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1