Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b75b292292c5de…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 18:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b931f76c049917fd5f1b3b78713d4f39 SHA-1: d74966618b838440b1c98dfd5ccb6b29130ac1ee SHA-256: c3b75b292292c5de0d0c622bb6a5584b48d84b7cc782ab7d7923264f139ee3af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, despite some being marked benign, point towards a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings suggest a malicious intent to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/sititevan.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210922203326.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/817230208.pdfIn PDF document text
    • https://dcimx.com/files/90543329237.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/6453799796.pdfIn PDF document text
    • http://vit-physio.de/file/51038441932.pdfIn PDF document text
    • http://www.nomorcantikmurah.com/file/1497190355.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/efdcde68cbbcb04a921f155bf7cd01c7/13119627229.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/nexazi.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/penipukazexa.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090515273596.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/79829950620.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/47643317713.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161357b210bbe5---1316440421.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090313480270554.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/65019243033.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/85408011000.pdfIn PDF document text
    • https://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/somibetejadapasamoloreze.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/48175814905.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109011754322648.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/sixogovotalebefupazutexoj.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109280608134059.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/15323235728.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/33063518865.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/85936279687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=which+is+the+best+offline+game+in+the+worldPDF 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_off0000af09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF09 15004 bytes
SHA-256: b8f703af4dd84d069878805abb315908d7896a5501082c5af3fd28cb2a826c64
font_01_sfnt_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 11144 bytes
SHA-256: c69a4d2fe577d070a95799043a2390bb641fc3b4596cb21a0e95f1de2f788758
font_02_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1