Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3983dd25208335a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 17:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ef96ef17317bc1ea7e5073561924a40 SHA-1: 9f0368f06919afc97c7dd57e9ef8af0a9eef9ae9 SHA-256: e3983dd25208335a9dbf51c09b256924399018feec980d3897a3e1f7f4b31601
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, one of which is a PDF hosted on schokofontaenen.de. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and detection strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://schokofontaenen.de/idata/7175367561.pdf In PDF document text
    • https://kurishupally.org/userfiles/file/28117129734.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/96671235958.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/wafubirurogogawad.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/xifopesasem.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/nopafagotipakawoparapo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161362d4a3ee78---80951446299.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/viravowaditonu.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/siwonepazowobomuvop.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/a5hn50pjbod5kugkdbokjoitv1/fiwofoxegibuvati.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/46917644830.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/wowab.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/38120183075.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/90341659993.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/nusotaru.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/ferogavurenirizufesotag.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/mozuxumufabulegamejik.pdfIn PDF document text
    • http://ridendo.cz/files/file/48042671285.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gepigulurenexeresobade.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/29464962627.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/21610601466.pdfIn PDF document text
    • http://jljemc.com/upload/files/9009620292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=unblock+messages+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_off0000e50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 17600 bytes
SHA-256: a0e3b562c0a3f5993d2e0991216e21d6ef37758f096fc8d863fa1928fa207704
font_01_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9E 10852 bytes
SHA-256: 58ed891c89fc5df4954d21c4b431c4f34cf2624f27017e0f455cc2f7f9b92983