Malicious PDF — malware analysis report

Static analysis result for SHA-256 7858347873816827…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 08:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d9e2eda7b09077e4d2480d3af0adfca SHA-1: a1686be1febdb33d5bb0c3ab5803620f2e54e52f SHA-256: 7858347873816827e463398015763ecdbdf8ef502338f5a18092b7af117fe26a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to external sites that host more PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farming on disposable hosting, suggesting a malicious intent to distribute links or potentially host malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://termocity.by/pics/files/kegilafevivogorepozu.pdf
    • https://martas.vodrsport.cz/uploads/files/20977223650.pdf
    • https://yourownadviser.com/ckfinder/userfiles/files/zipatosowoxotigagaj.pdf
    • http://hfnhsw.com/upload/files/82498559275.pdf
    • https://karapinler.com/calisma2/files/uploads/74705356386.pdf
    • https://maisonforville.be/documents/file/6474802969.pdf
    • https://wangwangcamp.com/uploads/files/202109010536176139.pdf
    • https://costabravas.com/uploads/localidades/files/4756722945.pdf
    • http://jingyilin.org/uploads/file/pugefemobupabijupi.pdf
    • http://studiorestagno.eu/userfiles/files/repenijeziramafopure.pdf
    • http://playbabydoll.com/userfiles/file/sulonuladivimemewalejula.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/vosudupuwexixawanobu.pdf
    • http://adhunikjewellers.com/ckfinder/userfiles/files/bemitifez.pdf
    • https://stehovani-ostrava.cz/static_pages_files/file/dipuja.pdf
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/pivabalapig.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210901_E6226287307E4D62.pdf
    • http://gorisum.net/fckeditor/upload_file/file/87381895655.pdf
    • http://punaide.com/userfiles/files/24719541223.pdf
    • http://thegioimaychaybo.com/app/webroot/uploads/files/padajofugomazugu.pdf
    • https://szabobuszrendeles.hu/files/files/toxikujaku.pdf
    • https://fundacjaartfreeart.pl/userfiles/file/korifix.pdf
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/sebijazaneboxa.pdf
    • http://agriturismoilnoceto.com/userfiles/files/6237160603.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=french+words+that+start+with+f
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d72d.bin
d2984af52f3ad6a7ffb802e7ba249d6658790b9e3435a32ca599e87c0ee39c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 10592 bytes
font_01_sfnt_off0000ef56.bin
63140cbdca013b1e2356f0a86ebbcf00b7deef9de58ff5a7c7ae614d20b9da48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 18540 bytes
font_02_sfnt_off00011f0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0D 16792 bytes

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