Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe45ae1b4d9e107d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 13:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 12c4af5ddd4ead503435fa557da928ee SHA-1: b160c0bc96908df50800e2e609710e923c86eaf3 SHA-256: fe45ae1b4d9e107d035a99d7ef6367efeca9a78a1d90f3ec4fdb2e0ed9903851
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable domains, indicative of a link farm designed to obscure the final destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kvzriu.org/images/file/worusoforoxen.pdf In PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/jajuj.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/86032213666.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/xivipetis.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/perotovejewuvebabewipigib.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/75327730545.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/rototofilepunajadi.pdfIn PDF document text
    • https://people11people.gr/uploads/File/gusudogoletovake.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/jefesekadidipomujevixise.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/webetikepogit.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/lakol.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/jogubavatetawenaguxituxo.pdfIn PDF document text
    • http://ukrfirework.com/images/file/5608205119.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/41648265227.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/nabarugamewibujose.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/96411191491.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/kuzilexevezovawip.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/51223937072.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/gaxibe.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161321a0e8f460---jezexagaxakunusapur.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/40610620599.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/88868500438.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/12991178145.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/kefujivurugit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=aplicaciones+android+para+playbookPDF link annotation
    • 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_off0000af0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC720 15256 bytes
SHA-256: fb0e5c0edc0e48362b0df07fd573565c194665741cd809bb9f455c7e076930a5
font_02_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 10736 bytes
SHA-256: 938cb589c677280bbfc02108584f6e454ea20e84258ca4514b5b5552c555c6a8