Malicious PDF — malware analysis report

Static analysis result for SHA-256 39db6e8c1a35f417…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 04:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f1c686a5345879ef995457cf557f5429 SHA-1: 438914fa2966632746aa529fbab146134c5457dc SHA-256: 39db6e8c1a35f417a331837ac6bbcb27a5ad269358fc87142a849adebf20e8ef
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on various domains. The presence of many unknown URLs suggests a distribution or redirection mechanism, likely to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rinducm1.com/contents/files/81416215319.pdf In PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/wodunidol.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/sogoxofododugodexezuvumex.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/78358039655.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/73721508910.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/94121777707.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/safute.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/zulofinaxibejurixake.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/48074904844.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/39698812802.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/83567010470.pdfIn PDF document text
    • https://webmenuplus.com/images/file/48224300236.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/wofofij.pdfIn PDF document text
    • http://ccsl.asia/files/39594537919.pdfIn PDF document text
    • https://vzglavniki.net/data/file/56549406041.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/kaxabewufapi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/98407488533.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/48348931267.pdfIn PDF document text
    • http://tfforming.ru/d/files/xegebiwixitukejakez.pdfIn PDF document text
    • https://bdata.vn/upload/files/govolaxuliwunili.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/vutimebazezudavexanobozij.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/73197372754.pdfIn PDF document text
    • https://tsolisp.com/files/file/86791963024.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/loxumivukitipaguxizalop.pdfIn PDF document text
    • http://csp.hu/editor_up/vatofularemudizov.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/iplaufa6i7e2s08faua9qitp75/14518794073.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133daf8b114e---82595764119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wwe+supercard+credits+generatorPDF 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_off0000b419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB419 10820 bytes
SHA-256: e1e96e7ac1eb12142242eb687d511895b3ead09fd32c6dff749514520e726060
font_01_sfnt_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 14736 bytes
SHA-256: f5eea8d4a122a75efdd3e405836c68383e707c4528ad13b6c5211603a23a6fde
font_02_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1