Malicious PDF — malware analysis report

Static analysis result for SHA-256 92543fce9a5f5f22…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 06:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 094fcd8523e776ad867818dfc7c727af SHA-1: 11390096507bde5c95c4bddd842ea5ffaeb3c4c6 SHA-256: 92543fce9a5f5f226ea680534a8cc5a08834135530a8b6ca34dc7a306138bd1e
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 as a phishing trojan. Heuristics indicate the presence of a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic suggests a tactic to obscure the true malicious destination by using many distinct hosts and links. While no scripts were extracted, the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c787e0f7e3f907cdcd38c077a7f5a982/43477347206.pdf In PDF document text
    • http://china-zub.ru/userfiles/file/39905311540.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/80463770744.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/turitasakefiwu.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/96250610258.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/tofijorupefowiganumova.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/famud.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ebc26ea99---livedonowujonojuz.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/putopo.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/27474371960.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/sebex.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/30635459785.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/bapuvokomub.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/gizefigev.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/824060823.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/17932634704.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77677308971.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/zupafonekejupofuj.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///kasutugezakuzobotigobax.pdfIn PDF document text
    • http://attlas.center/userfiles/file/65797221145.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210908141358947.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/70664878645.pdfIn PDF document text
    • https://senegal4d.com/contents/files/lavufonodomojilemu.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/21204576426.pdfIn PDF document text
    • http://status.cz/UserFiles/File/kidebulame.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/rijufamujabiko.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/c8cbd83068f0123f4026a5e4c1766312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+real+car+parkingPDF 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_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 18056 bytes
SHA-256: a59a135b060da2f06abce431d2c01202f46c85ca582e8ef58a29d5ea170f8770
font_01_sfnt_off0001092c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 10604 bytes
SHA-256: fe16442df4a1a3b9c79f0769f6e15b35d746dc425cc9b5413d1eafc5e925392a
font_02_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1