Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cbefc97b10d3d9…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 13:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4552753275522a2eea8f7a4a7223a5a4 SHA-1: 587da107a9638c47f89b10474c92acce3846b8fd SHA-256: 20cbefc97b10d3d9b4ac22ebc8ebdc95c1176fdfad4e9434e6e1f67447185d42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are structured as link farms. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of hosting many links on disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pistant.ru/uplcv?utm_term=android+auto+guide
    • http://luchetti.it/userfiles/files/sadofovomupexikojalexevom.pdf
    • http://7m-shop.com/userfiles/file/62679808444.pdf
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/julinekowitojowibevoje.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/21512960700.pdf
    • http://proart.by/media/file/labuponituk.pdf
    • http://healingtown.org/userData/board/file/66951404073.pdf
    • https://castel.ro/userfiles/file/95321941073.pdf
    • http://prabashproperties.com/ckfinder/userfiles/files/zexebofof.pdf
    • http://www.rify.us/cms-uploads/files/zakekawadonuxakafi.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161442dba44535---pozokatirizuruwimoxupagok.pdf
    • http://apismorava.eu/docs/lesegofidi.pdf
    • https://robodom.si/files_vsebine/23606031981.pdf
    • https://ntiverification.com/userfiles/file/dajafuwiwo.pdf
    • http://jjkxmy.com/upload/files/202109120118241184.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/36806512872.pdf
    • http://www.jindatunnel.com/up_files/file/29952125942.pdf
    • http://fanta-life.com/userfiles/file/pixubupiwevomejuzatuper.pdf
    • http://pokemom2.com/uploads/files/sugoduranuzegozu.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/gozisazaviveme.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0f41884fb---9423539474.pdf
    • http://xn--z92bzy85x.com/userData/board/file/18636744802.pdf
    • http://kirakuramenandsushi.com/uploads/files/bamotuvemibanud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ee.bin
f9b6c03c11e798f155c990a3ebcf36ea5dd45b39ba31a6b4c4c949d6f8f82a7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 10288 bytes
font_01_sfnt_off0000eb01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 16792 bytes
font_02_sfnt_off00010313.bin
fbdd2ecb5ab3f6eadf06311d36c1230caf60094ea136f7836e0a047e53161b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 17572 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.