Malicious PDF — malware analysis report

Static analysis result for SHA-256 590e4f2e4e7bdf7e…

MALICIOUS

PDF

73.9 KB Created: 2021-09-14 14:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b9009194e77a5af13908c6d650474be SHA-1: 97223acd262d9261b7dab5f2d27c6f2d19fab027 SHA-256: 590e4f2e4e7bdf7e4a77e1f7497c76ce91f362b56cb7b6c33bf3b94713f97293
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://grafitym.kz/files/file/votefamademejatopakage.pdf In PDF document text
    • http://csc-0411.com/userfiles/file/20210902002125_hv5w40.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/punobumekuropomox.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/20753007146.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/cvjukmgsg0es3003d10d19c1b3/rolid.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/bijunelomurov.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/xerewimuviloponube.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/52453072719.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/vujomojumevif.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/jovarujifavuwesaza.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210914105343.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/bujeninubamixosufudi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/3148595472.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-7/20210907164722923286.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/70322672929.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161372b805a760---63288805745.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/resirobidejonuzov.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/refagudasemej.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386bfa33a2e---15715033994.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/636625333.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/32918814546.pdfIn PDF document text
    • https://etadelloro.it/images/file/kabejeg.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/buvijofipukoguj.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/6905059389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=john+wick+3+streaming+engPDF 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_off0000bb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 17588 bytes
SHA-256: 36fa75e0df06590b5ade71b4b9a296e8e171dd623d3030b4b00310578abb4ec1
font_02_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 10972 bytes
SHA-256: a3ea96838722e211905e7b955eeba2a34f84b35e8ffc6ccd1ec9494b8ff6534d