Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2a470f6c212bd6…

MALICIOUS

PDF

88.1 KB Created: 2021-09-17 14:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9a65d6268a750fa5711a9fb7bc5a4b4 SHA-1: 15df76a13858c642f04906d0780fe93a356d07ee SHA-256: ac2a470f6c212bd67bb7e518f99ad48d5487719f5dd03b180029e19549d4ff80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=st+lucia+brisbane+postcode PDF link annotation
    • https://sanghvicranes.com/staging/media/nanifudatosulig.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/6340882996.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e4581eca---93887460733.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/lerizolalitapisitoriv.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/83831023528.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/30300493362.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/66265874795.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/zilizijawosamuxir.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109170954464197.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/ladel.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/kagebuvekopezajox.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/22104223401.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/79792681222.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/61951080361.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/52302201842.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210901191329.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/jewusukojakejuk.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/17311473656.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-16/20210916222609332019.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/gojowi.pdfIn PDF document text
    • http://na3.it/misc/file/40596565384.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bcd6d8fd8524b40a0bc799641d3b7ea5/26432697621.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/jegowuniwi.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/48896981807.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_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 18232 bytes
SHA-256: 44173a2590de92d608ab8ab2e9f1361f063e16d3c076b3c94e4e5f2e01c86a97
font_01_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 10820 bytes
SHA-256: 5961ce1efaf256d2b63f652138867c11fda9f12950b163ebc4915e37201de4a2
font_02_sfnt_off00013a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1