Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f51e3a3538f0744…

MALICIOUS

PDF

74.7 KB Created: 2021-09-27 15:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ceab903b2137266aeed623dac740844 SHA-1: 3cbd5f0493fd527e36f5e5acc5aa67e209734909 SHA-256: 8f51e3a3538f0744870987a315ea17ee933433bd12d6234acc7eb075e887f9f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm designed to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://philabc.ru/uplcv?utm_term=best+adas+android+app PDF link annotation
    • http://divorcefinance.nl/uploads/file/rexitalilonosir.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/lasujorafezifugaxotod.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/98637297515.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/61740131183.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/waroxofu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133030d6d517---54776345242.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/xuwodimefaxolet.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/19172491761.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/9178439437.pdfIn PDF document text
    • https://biomisszio.hu/tmp/wikagugejitiv.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/88024179195.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/15570155664.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/22153690567.pdfIn PDF document text
    • https://trieurodata.ro/images/file/84449489954.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vumubavoterarakanitoxowas.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/jitomavafebibu.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/227166336.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/78078134925.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/livurotivoxog.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/61929129638.pdfIn PDF document text
    • https://dance-lab-new-delhi.com/userfiles/file/lavotidogenozegegovefive.pdfIn PDF document text
    • http://glassick.com/userfiles/file/nutirepetupel.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/1770213565.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614b844e5b20a---30666026233.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/daxudupagaduse.pdfIn PDF document text
    • 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_off0000bcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAC 18336 bytes
SHA-256: ba9d9ebd37dc88c1cc735b8c2724a76a2c23f0c94dfb0c651bb5e17bf6f5f5e3
font_01_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 10392 bytes
SHA-256: a6beaf37dbc25444bcabdbf8f5748a2d40b2a4e18ca6c5331a9345eb3227f234