Malicious PDF — malware analysis report

Static analysis result for SHA-256 961aaf5e595037d5…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 03:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11ee474fcbe29fbd9c024d9eaebbfaf3 SHA-1: 124281dd60d7c056cb26ebe1f8d7cefcb957c457 SHA-256: 961aaf5e595037d5ca86aa4701689a2b30707049c88c450194460c36ed81ded2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains URLs that are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://yonezawanet.jp/units/24250/zcycom/files/14414607725.pdf In PDF document text
    • https://maintogelonline2.org/contents/files/denumozakinajedotu.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/18412537233.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/50188417706.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/40099269174.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/10500840137.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/bipebafanufoj.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/fozifab.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd01a2afae---69003071688.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/gomekagixigonujotubogul.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/11020650657.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/xejalid.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/59865666449.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/sugufajexa.pdfIn PDF document text
    • https://visualarchive.bg/files/rozurakuvivovepuxux.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/27917351535.pdfIn PDF document text
    • https://2winit.com/Files/files/67997845238.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/fizikinevevogezizorug.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/serapepokovapeneleviv.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/bazino.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/28057865144.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/27065941145.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/vixurepoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nba+2k17+apk+obb+modPDF 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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 16796 bytes
SHA-256: 17200970e234564bf0e819ec13f99649c9a675dd1ab1708416922475e68c99d9
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 10244 bytes
SHA-256: a5b87ac414f93ee3a0579a60faafa256b27575a440219f93255ae17b50215720
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1