Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfb34940a700b1a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 06:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f832a1b6faf5ff1f6fbba71b95729dae SHA-1: f73ffdbfc463260e6dfec4e1f9bcfc65f55e7ce6 SHA-256: 0cfb34940a700b1a592e9ed02412399eefb91f7fe2f3995b53e49251751f1bcb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=where+is+my+email+on+my+phone PDF link annotation
    • http://analhospital.net/file/files/gilosoduvujexajugumuval.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/nakemivugarifip.pdfIn PDF document text
    • http://esejsc.com/upload/files/vagoki.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/93613317241.pdfIn PDF document text
    • http://exim5.hu/_user/file/lavasatoludafe.pdfIn PDF document text
    • http://hybsch.it/upload/file/nuvusepidagadigepixe.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/35656147305.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/75625009890.pdfIn PDF document text
    • http://rld-carbon.com/file/89139539414.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/44962232721.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/wewun.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/44776801676.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/49836208820.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139a51f89ec3---43217808518.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161328c531df89---xuzavexitakulokojotekurez.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/48746453077.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/93444192140.pdfIn PDF document text
    • http://ndt-ultratech.com/files/39054010765.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/lupoju.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/2021912148587283.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/zawomojeleniburomez.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/bemebivuvapasoxejuz.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_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 10524 bytes
SHA-256: 4d7515e8335c95da475754df3d9e337d6b986f4c1a6a9657c884c4dcc1c1e18a
font_01_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 18168 bytes
SHA-256: 0e6a6058e10f96ee0ee6fb51e75e730fd90e5f3c4b36c9e7d8553f539e118af8
font_02_sfnt_off000125c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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