Malicious PDF — malware analysis report

Static analysis result for SHA-256 8416808da9c1562f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 08:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2801926b15a88e74262a68db29495012 SHA-1: 3dd9d0ea7695ba6b8caf6dd3d34671c35bf92d15 SHA-256: 8416808da9c1562ffaedc106cfe183bef86386436a71ff1b8c4cd242c70b1f5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external URLs, many hosted on disposable domains, indicating a link farm or phishing attempt. The PDF structure and numerous embedded links suggest it is designed to lure users to external malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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=inshot+mp3+cutter+and+ringtone+maker PDF link annotation
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/3rh0k16eq130rvi3mnte3eragn/nezolikuzasikatadonoza.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090304252190.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/31188665842.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/nimosinorapag.pdfIn PDF document text
    • https://pcetravel.com/files/file/rimigeburuboridabotugom.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/xerevixepo.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/16216583358.pdfIn PDF document text
    • http://humanlitech.com/files/files/69914807514.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/35351716093.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/94531316087.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6138df39ea32c.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/zezebumi.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/82131494937.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/gepokagikikewuxesoni.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/76266068847.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/xolakenekelokowanu.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/nudujuwasaviropakimigoxi.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/dunuguwewajitez.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/lasuvubituzuzigutesulu.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/lufojinoburopeb.pdfIn PDF document text
    • http://thaide.org/userfiles/file/degaw.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/30294071959.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/45412523520.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/gilolotuwetubesodebufa.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///2346416223.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/kodazutu.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/48910090322.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/piriwetodarokavuroga.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_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 18812 bytes
SHA-256: d7174a08d8bf86ad9a45b06e00ab5e8f9d6dd7e08b191df410e3903b20d8faf2
font_01_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001260d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 11232 bytes
SHA-256: 013104f1a1efc4f912d0432f417b3395848c7d147fcf6a014154888308d12e00