Malicious PDF — malware analysis report

Static analysis result for SHA-256 0465344a16111f36…

MALICIOUS

PDF

67.4 KB Created: 2021-09-24 17:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a2d4d6cabb6a3e7675f601f322d19131 SHA-1: df490fd50f17d8db7539f549631d82dd44f0df72 SHA-256: 0465344a16111f3624f539b5d746d6ea179d4faef6ebf56b595b2ba358f7d767
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading further malicious payloads.

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 http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef41991546---sezel.pdf In PDF document text
    • http://lasfyy.com/uploadfile/file/20210903093415635.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/xizogegoneketoxuloj.pdfIn PDF document text
    • http://hotechike.com/files/files/58725494100.pdfIn PDF document text
    • http://strandedtattoo.com/file/fuvebumefedivefegoj.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/35990601921.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/boxonurodeki.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/66873400892.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210924_2BEAA18DB8543C5B.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/66501900995.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/doboropafokosasokinaxej.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/fiwafukovulite.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109061632228612.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/75395365983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fortnite+simulator+unblockedPDF 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_off0000a47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000bc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8D 16940 bytes
SHA-256: b85d0d7126ddf03ff6677c936f6691f3c8ebf8a384e49ea94080b52c8d6218a7
font_02_sfnt_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 10840 bytes
SHA-256: 83767bd2a30bd19c81cae22086806178c5d23498ec6126e647c5851e46d931c1

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