Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9951ef5b66d96a6…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 01:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2fefc42a0460f835d886a1f3b8990c87 SHA-1: 810f7963f043a800365db182ac8b7e2ef59c02ee SHA-256: f9951ef5b66d96a61f8297f2216d772fede442102f4ca1bd72704ad57595ed11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many of which are structured as link farms on disposable hosting, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used to redirect users to malicious sites.

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://huntic.ru/uplcv?utm_term=samsung+galaxy+young+android+version PDF link annotation
    • http://tevukasveza.lt/ckfinder/userfiles/files/79229742675.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/75688556869.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/sidisibinaregiteme.pdfIn PDF document text
    • https://ms01bet.net/contents/files/tikudi.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906012143621542.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/36699708831.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/92171359703.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/31142951293.pdfIn PDF document text
    • https://patc.fr/imagesfile/13001561355.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/sifagomev.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/mibore.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/fojejozudidimopul.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/55177765927.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/vubafupokeluwaderij.pdfIn PDF document text
    • https://ivanamihic.com/files/posoxu.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/90589647165.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/14174219583.pdfIn PDF document text
    • http://rurisnet.org/images/file/zefuwadalawugomukulo.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/8035992480.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/11611011895.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/13734361404.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_off0000aaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAED 10952 bytes
SHA-256: 56f50d82fd0041f6c7cbe7ec43718cba54bd28237d116f6dbe5e8b92b056e4c5
font_01_sfnt_off0000c416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 15812 bytes
SHA-256: d078a0a819130b2c73c4c3a3c33d5f85bdaa2e33b43355d48367f1b871935df8

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