Malicious PDF — malware analysis report

Static analysis result for SHA-256 4214b61c25f81ea9…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 04:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d991c6a8fb40a1702ab369ad55be8bad SHA-1: a60ea24d631b0f127acd251d3efc12146994218e SHA-256: 4214b61c25f81ea910fcab088037973bcea6bcc98e9ed72621a51e9c03694015
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The presence of embedded JavaScript and numerous external URIs suggests an attempt to redirect the user to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://s2group.pl/userfiles/file/tusabaposaxonugo.pdf In PDF document text
    • http://dautuck.com/uploads/userfiles/file/xowewonosetesepixiragalo.pdfIn PDF document text
    • http://terminsk.by/pics/files/rogelatevatikigobexomal.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/66141300042.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/lijenanurajawiginiraberit.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/pofezava.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/95544397740.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/zemuwugo.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/34291227332.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/81766803513.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25685023687.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/xidajoxofidogewukeliwuwix.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/rozokurufofuledixen.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5531818097.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/73538628638.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613043b047544---babowozurarememulewuxudi.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/31412304445.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/nakogowigobetojewuga.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/58382942602.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/25565459294.pdfIn PDF document text
    • https://efnnma.org/files/file/33964920487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=shot+vision+launch+monitor+app+for+androidPDF 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_off0000af6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6E 10992 bytes
SHA-256: 5c83f1b906c844717ae84c8c5b0d5745c52061ecc8399d52f62d994fdfe99edd
font_01_sfnt_off0000c8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 16472 bytes
SHA-256: 3180feed3caef1f2be62b46fa5c6aeaf95b58f63471d4e71b2f24f9e3d2a579d

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