Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6415de080a1986…

MALICIOUS

PDF

77.6 KB Created: 2021-09-11 13:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3aeb8a9897bd6db9dd3f87581292f33f SHA-1: d1a64a4771f21c020fce99a40edd4fecc0232d19 SHA-256: 5f6415de080a1986ff531708b9495150852b64e9d28799dba22a56eac731d1f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://zgkimsteszew.pl/img/upload/files/87315124236.pdf In PDF document text
    • http://terezmisszio.eu/files/file/84593653015.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210911052018.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/8290253817.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/60078178011.pdfIn PDF document text
    • http://recrute.fr/files/files/nanimoxorekule.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/xitixerorigije.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/bediloziwesomadoxonoloj.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/wenonovokemera.pdfIn PDF document text
    • http://chamdure.com/DATA/files/27135381205.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/78386685141.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/gowizege.pdfIn PDF document text
    • https://baptistfriends.org/media/xoginewulunu.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/waxijuge.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/kiwetabepapawuxatugemigo.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/zogexekiranak.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109110525587355.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/gawamobezu.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/25306713717.pdfIn PDF document text
    • http://chinahongji.com/d/files/julerijareweponezusofet.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e8e1fb10d83a59a9c446f83f1fa19f27/mumozav.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/tuxijuliwute.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/pezefanubasozod.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/48369983250.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/vugubofipazibaxivajifejos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=titan+quest+apk+modPDF 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_off0000c6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E7 10708 bytes
SHA-256: d9cea2b93f10e413610f7d3825539cb3ad0f8db38fee6df8f7b582e521432334
font_01_sfnt_off0000df45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 18824 bytes
SHA-256: 4acf410af47754273cec2354c7b9b2965e5b949f77e8c1d742cc86712aa51847
font_02_sfnt_off000110f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1