Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c3ba6675e3d13d…

MALICIOUS

PDF

76.8 KB Created: 2021-10-01 12:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bb3584f330ce31c3021e89b7ad657f2 SHA-1: 5b8bf4191daf52eff1bc46445552ae59273b2079 SHA-256: 25c3ba6675e3d13d6bed7e9dd6f9f10e3f7828d11b40d11cebe7e7146adbc95d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and embedded links point towards a common tactic of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://suny.cz/files/file/17995119846.pdf In PDF document text
    • http://studiomistretta.com/userfiles/files/zumixuno.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/1361284572.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/govofuvoga.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/71880342880.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/galave.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/munebez.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/70150235128.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/64911057678.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/muxovakup.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/tofoxuzunaguxemiju.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/masofimexa.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kqvk6b2ne7lurqhuvdrec2bpi6/jinuxoxikomuj.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/31491717084.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e82d1aa94cde72c8c58c12a13100935b/84440975953.pdfIn PDF document text
    • http://4bx.pl/public/file/vomasogulogutafusunewakij.pdfIn PDF document text
    • http://sujoydhar.com/userfiles/files/guzezelamotoji.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/88904317264.pdfIn PDF document text
    • http://okcashbagusa.com/uploads/files/61019468735.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/24561660156.pdfIn PDF document text
    • http://cascad-trans.ru/files/65044253234.pdfIn PDF document text
    • http://hanifeugur.com/image/files/jupekot.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/90017798668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nuclear+chemistry+book+pdf+free+downloadPDF 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_off0000be34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE34 19072 bytes
SHA-256: 4672a62ad00ebf61af0d76347fe41efa4d5722359fc6727a8f711e6ac0131654
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 11392 bytes
SHA-256: 9abf536366f4b214e043faebe0660669859068f055a3beee1f3a0355b3f08b80

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