Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35fdec4012d507b…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 12:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e51e70ec91396b85faf7449e1ef2f633 SHA-1: 8dbb618ef4d45bdcf894774d22065ed7b0d8dbce SHA-256: a35fdec4012d507b5c6bf2f854acbe4fbaf6cbd953e21706559e27d9037515de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a large number of external URIs. The PDF document acts as a link farm, directing users to various domains, which is a common tactic for phishing or distributing further malware. The presence of embedded JavaScript suggests potential for exploitation or further malicious actions within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://catamma.ru/uplcv?utm_term=pubg+kr+version+highly+compressed PDF link annotation
    • https://poolpoint.be/uploads/file/9564173338.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/73266114649.pdfIn PDF document text
    • http://winso.tw/userfiles/file/fazituzetagavipizude.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/vobikolololisavasipi.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/dugafimisabevijewemetig.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/98387352631.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/98885280798.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/zewimamano.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/turejireni.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/jokiveranefiwusi.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/jewazavobowawilamako.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/74077079962.pdfIn PDF document text
    • http://master-vin.ru/files/file/satisenokizipifosodek.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/kevenujibajuzozazerij.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/dubelorajakef.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/gawebepebejuwuweb.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/45404282863.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/6394768959.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152a2c8d4a38---javuxosoneviruxavewawij.pdfIn PDF document text
    • http://wsm.hk/images/files/33369610291.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/91897891373.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_off0000ace7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE7 11212 bytes
SHA-256: 068904d7167ba65a96e0e42618199be8234f01538b228fc2941156b3695a7a33
font_01_sfnt_off0000c688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 16288 bytes
SHA-256: 06c3cbcb3e2191f5726bdff02d1ec74c956aec1836a399f8714d1b796700eb63

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