Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bdebea887f246d…

MALICIOUS

PDF

80.2 KB Created: 2021-10-12 05:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a32762742060c83054c04f21a1c588f0 SHA-1: e1565882f6e53784e1b43d7347b5c81e3e85539d SHA-256: 65bdebea887f246d47c239e14c8093154ba72066d3c1c77dc99a110c30bb0c19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://luatkhangthai.vn/upload/fck/file/jozoresuwituxir.pdf In PDF document text
    • http://expresskaliski.info/file/40084873516.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/zovawaxavuseroma.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/tojofag.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/togelifexi.pdfIn PDF document text
    • http://palami.by/images/file/6732824073.pdfIn PDF document text
    • https://dutchhaves.com/uploads/files/202110060754216126.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/wujelanudeguregaraxize.pdfIn PDF document text
    • https://hoalavender.net/upload/files/supumolimokenenutikikid.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/11101274942.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614395ae33ce4---19891256501.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/67809125038.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/maviret.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/guravavovodaziv.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/xipawivusiwusi.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210910182046.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/sowaka.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/zazogumekinagerasovi.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021100316505689.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/75551298277.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/93247625896.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/83541261244.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BcFPVxLj4jw/uplcv?utm_term=halloween+scramble+words+answersPDF 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_off0000d61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 17604 bytes
SHA-256: 61bf67b21fbaa40def579a6e651f0e8b9a33b60d7cf350d96e743689f2d2535f
font_02_sfnt_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 10556 bytes
SHA-256: f12a56e2b4618b2cf6d9b552051d77e328b39115371e52db294bf5e760d5f2dd

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