Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4071080be24719…

MALICIOUS

PDF

67.8 KB Created: 2021-09-28 01:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfe908ba03aea53aee4f71abc6e5b633 SHA-1: ef9c9823ae61d3a191723cf895a72e3a447b24ef SHA-256: 7c4071080be24719e8c7f0c3f482f4b969da310e332a0cc9c97112981dc65cbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=locker+codes+nba+2k20+my+team PDF link annotation
    • http://koddous.com/userfiles/file/33943931008.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/nixemavinawe.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/mobam.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/61118548157.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16152323d2cefa---26286044488.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/wolakiwimegoxipinojivaza.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/20076766206.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/56838063818.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/gidijekamasodixusonutoman.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/pukinuwajalawekurujuxiko.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/retutozopisikanowabawawo.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/zozumasalerogapil.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/ritolasubizavefevupu.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/zepuxiniduzubaluxomuj.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/jejufipube.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b6561fce43a8c830ae37363d7f350c98/zurisi.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/tanoxuxovelivididumoma.pdfIn PDF document text
    • http://salwex.hu/file/nejixirifelajige.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/79283286841.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/ruwojeziviw.pdfIn PDF document text
    • http://okun.su/upload/file/zimofufuwelikezoxigam.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_off0000abdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABDC 14504 bytes
SHA-256: 0f4caed4c410f1eb3fbd23dab28dc412d5bd6b1eb7e29d8d82197e844b252940
font_01_sfnt_off0000d0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 10940 bytes
SHA-256: 13b8ab5b38ed8553779bb53b31f23c82d71bd121b5fc6b26b4a2097787fcc3e8

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