Malicious PDF — malware analysis report

Static analysis result for SHA-256 946c517e3764dd9a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 14:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afa1e15b96a0a4b9757caa63df16f4a1 SHA-1: 1828644b36cd98d218048c939391ff69ac2d8ce6 SHA-256: 946c517e3764dd9a8a5d6cf99a0bb3cad8f553ef2e1cbc795c74577447e3532a
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs and embedded URLs pointing to potentially malicious domains. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent. The presence of multiple unknown URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ventadeterrenosurbanos.com/userfiles/file/samen.pdf In PDF document text
    • http://mbfeed.vn/upload/files/88599628942.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/dopesofor.pdfIn PDF document text
    • https://petikdaun.com/contents/files/76345889841.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/10767944159.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/fifevoxitosezotefi.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/4848267327.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/91654710544.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/xesedenomijere.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/49766061818.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/tupabevujozefaxedowufol.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/gitaxanilinuje.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c07f09b4fb---36765581405.pdfIn PDF document text
    • https://fond.ru/userfiles/file/vozokenesesevoneg.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/retutozopisikanowabawawo.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/89227563255.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/famoti.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/bajewidirurixebogopori.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/4080118581.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/bepifilenojekuvebokuj.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/48989600646.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/25536244398.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/lobilawesapegubugojerimom.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/68801818968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=all+games+hacking+appPDF 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_off0000e06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 17520 bytes
SHA-256: 7a673225bdbeb958aaaec85af8c13008b4f52a7f23450d8cd7859e733823f7d2
font_02_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 10576 bytes
SHA-256: 81975c1abf3105f57a062c53f311d0188ffa3baff845ef56eb0d1e277429422f