Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c40b1845f0a0b2a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-10 03:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6787832c6b5c3de658676ad6778166f6 SHA-1: 83be0a472edcaaa22f6ec385bfde7f48f23a93fc SHA-256: 9c40b1845f0a0b2a6e28af3b2926b24355cd523c62671db51514e673e75babe9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=basic+accounting+formulas+pdf PDF link annotation
    • http://szymonadamczyk.pl/uploads/fck/file/10685245283.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161354c07b9f43---kalatewu.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/vudeluninosoripufijudixi.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/majanodikiwateluna.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/situteveni.pdfIn PDF document text
    • http://wsm.hk/images/files/sogasodegixep.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/zutorag.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/14841050241.pdfIn PDF document text
    • https://securitydm.com/slicice/file/93408458775.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30212264965.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/57672250406.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/vuketigidakaxozekojalo.pdfIn PDF document text
    • http://sushibelovo.ru/files/guduwawulasu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161391b858cb2d---fasezomowifedenug.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/gobasosegaxifunofuxufam.pdfIn PDF document text
    • http://indemo.pl/Image/files/5896721444.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/14714761523.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/lilevupetelo.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/66370902288.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/20969211394.pdfIn PDF document text
    • http://cissi.it/userfiles/files/94008364452.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090401013473499.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/32119064978.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///jizijozujonux.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_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 18472 bytes
SHA-256: e5cd6d85108a15286396265eb6a4b12586054a129809117565709f2a325244d0
font_01_sfnt_off00011787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9E 10984 bytes
SHA-256: 414732014cfefd287406dd5dc5ccb508ee35b15d5ce356f59fc7441f012b50eb

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