Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23f544bf7e67b4e…

MALICIOUS

PDF

68.7 KB Created: 2021-09-17 21:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e232a4c6bd1d9281f71ed6556ac4bba9 SHA-1: 52ec9aa614c9fe56a2074cc2b2009dab1bcd50dd SHA-256: e23f544bf7e67b4e6ddc1c230232b4d36f092398bc2c73cb7da823e5d1213449
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute code upon opening. It also features a high number of external URIs pointing to various domains, flagged as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://sangjeom.com/userfiles/file///vowuputerosapupezeve.pdf In PDF document text
    • http://mofrantech.com/userfiles/file/mesunavumawobazup.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9828abfe---vabov.pdfIn PDF document text
    • https://majubesar.com/contents/files/78777150411.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/zerugabekete.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/razowawaxopipi.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/kezorumifasavirimaravu.pdfIn PDF document text
    • http://www.bandungmesin.com/file/75750437707.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/dosikovoxu.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/48310231504.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/49656649529.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/nowagexabitoxupa.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/tesatitabewox.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/lovipubojoberopafosag.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/tebepola.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/27200401876.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/51665165889.pdfIn PDF document text
    • http://keramann.ru/uploads/files/zibobisalopevegujomuwizo.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/62472717573.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/4348245294.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6522a5c5---21008341473.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/71232031164.pdfIn PDF document text
    • http://prota.ru/upload/files/vemokanididokenakogos.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/885859149.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/mijegafumijupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+download+contacts+from+android+to+iphonePDF 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_off0000b032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB032 14284 bytes
SHA-256: 1dd22bd9c06500149eea361a49ef906ca9e32c76f4393817688582c16f2f6cb4
font_01_sfnt_off0000d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 10960 bytes
SHA-256: e147504c45a3a1cc0e98e5b1047fc0874eb3017c40bfcb2097010496ba88de8b
font_02_sfnt_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1