Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2b2abb811a15eb…

MALICIOUS

PDF

68.1 KB Created: 2021-09-28 01:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c6ccb9c950d773d6593c5df8ae524754 SHA-1: 3f125a364e04a70966e2d875e856ae24d7371a63 SHA-256: ec2b2abb811a15eb681f3fd4e0681c76f4a941f87cf6880ccf570e5cdce2a3c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crewmak.ru/uplcv?utm_term=vip+miner+apk+download PDF link annotation
    • https://theurbanthinktank.com/files/ruxinavuja.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/piwetu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131911e29513---21912609313.pdfIn PDF document text
    • http://uhorder.com/upload/files/nufejolujozojodat.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/46191622803.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3909e59e2177c0e3b35f21a3f2b5e090/jisurejodifereboki.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/33924401030.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/2489835641.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/niretoke.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/8314639623.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/94122110865.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/75112439361.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/lawegib.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/22307012669.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/puzezanipemalekimiki.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/94286567071.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/kokijipuzof.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210906093656195541z2xkfk.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/xugimexewubipixat.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/naberorusagutunur.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/94761927020.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/mijakediwewapumogiziw.pdfIn PDF document text
    • https://svltv.in/userfiles/files/wemododur.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_off0000ac5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5B 14964 bytes
SHA-256: 555b5776d105ebf8d5479f17af4287e4b2b40c33c352fe758cb0cd6608e45b2a
font_01_sfnt_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 10432 bytes
SHA-256: 1e1ab4cf9c018089d734495f6ba537722ae56c84daf9c50779b3a72cb50e1b24

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