Malicious PDF — malware analysis report

Static analysis result for SHA-256 7945cfccc0b797da…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 15:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed486e5eaf75a86f475b08f085d5d311 SHA-1: 5b197a14ac19e98038b854bc3088a5245ffa6f80 SHA-256: 7945cfccc0b797da465789c7f90d1b7a3037f007e2338d794d7492828621c974
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://e-motorcycle.tw/upload/emotorcycle/files/kamefovokovivojas.pdf In PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021982229208617.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/xilosamatupex.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/lisofomeguruwid.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/abc8f1ef4df9c399c2507ca691815be4/65653731457.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/borumikizivemowafivov.pdfIn PDF document text
    • https://5uempat.com/contents/files/86275197695.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/70622674623.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/98510829373.pdfIn PDF document text
    • http://praguetransfer.com/files/file/85509404817.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/81685853178.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/worokep.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/13543521787.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/73480952099.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/85340278683.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/53155494318.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/tewepak.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/36870236193.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/74839139024.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb87a5ec9---kimevedebax.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/27450262434.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/gexemiwanuziri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kp+thakur+english+grammar+pdf+free+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/70778102469.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_off0000b395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB395 14356 bytes
SHA-256: 288518f8d8c11ea6577c9daa67289911e99a36f397632d27aacdf65a46d10f3a
font_01_sfnt_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 11212 bytes
SHA-256: a92d44cb82896f7e5526a04ea69ef434179916b9498e75897de6088809e8c5cd

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