Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf4dd222d30ca5c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 21:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3eaaaef2974ee5d76a6477ad7642b16e SHA-1: 04f9b0e50a73cf83cbb7fc2ccc70b01f5dd863d9 SHA-256: acf4dd222d30ca5cce7ce59add3f90298c335a6ee2218878a7e60cbb7d73ee7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains or are part of link farms, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure point towards a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=samsung+screen+repair+cost+india PDF link annotation
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6ce7d170---mikatizomakotivibebelesan.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/wesijive.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/mojuratow.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/57148645258.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/xoxirat.pdfIn PDF document text
    • http://czyxchem.com/upload/files/4551132682.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/83906943656.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a3de73aa---jutubumaranuva.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/xoxupadunog.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/43774795885.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/71412157829.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/nesararejuforafatoboxe.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909015634902085.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/vofekososaze.pdfIn PDF document text
    • http://origo.ws/userfiles/file/69501250879.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/49233449111.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/40882021930.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/puvure.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/74292863916.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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 10984 bytes
SHA-256: 49ee04fd1de559a0b86897efa1b634e99bf7c69301768fcc4ca725152a433f5a
font_01_sfnt_off0000ce15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 16792 bytes
SHA-256: 8261fa09b5de01af302330b73dbc7042b415d5a4d6362ee9aab6685860fa15f3

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