Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8312b3a68640d7b…

MALICIOUS

PDF

67.5 KB Created: 2021-09-10 05:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a935fc26c55b28b51439cad46d071c1 SHA-1: 8c1f782f7465444c257b196ebfeb9577db59ca04 SHA-256: c8312b3a68640d7b1234a47ea8626c080cc8b2236e9d6bd73a1dd11ff5e9705d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable links. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to disguise a malicious link. The numerous extracted URLs, many using 'file' or 'upload' in their paths, suggest a distribution point for malicious content. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ketchas.ru/uplcv?utm_term=best+unofficial+phone+under+15000+in+bd PDF link annotation
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210908123828.pdfIn PDF document text
    • http://strandedtattoo.info/file/josoporokavof.pdfIn PDF document text
    • http://chinalabware.es/d/files/fanugipipikakanuwor.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/togap.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/51604082783.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/17336087948.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/60676427724.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/74878452386.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/34238607745.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/3622758857.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/24220326892.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/36906017964.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/50011204222.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/42934087662.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/47100373887.pdfIn PDF document text
    • http://esistore.de/userfiles/file/buvupobewuxozok.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/59011355153.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613598eb8c5df---fubowesetimezisezetima.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/82857550547.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/73228171304.pdfIn PDF document text
    • https://olterus.org/contents/files/98642331395.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_off0000ab75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38C 11320 bytes
SHA-256: 50a8f7026dfb8d8fdf6aceebecc3aee10681fd47cc6a88c91c4d3dae72ec3694
font_02_sfnt_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 14012 bytes
SHA-256: 742d886197cc2e0050d59bf6d0195cb316da7dca38e55251095bfdac7b43a3ee

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