Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f6bb97baac04e1…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 17:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 708b098212de164d177a3ad16a6fba4c SHA-1: 269a2b1c21ab725548714f971b07113f9f5052d2 SHA-256: 97f6bb97baac04e1416466d57d6608c0e497aba663793e5360e9d9cf609ffb7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://subarini.ro/mm/file/51628013136.pdf In PDF document text
    • http://gamjagolla.com/uploads/files/fizilusufoxawogi.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/88856711551.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/rotozavikulizisajisisu.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/42900582855.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8b166938---gojapuwarapowovakoter.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/78328685699.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/88660265765.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/bizub.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/danewivegajolalukimadodas.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xogebudifosisekeve.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109060426181537.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/99653610185.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210910091001.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/88251358290.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/57940970674.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/11080268549.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/daxudiwev.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210905/16307932855201.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/gumakewopigod.pdfIn PDF document text
    • https://oasis-travel.ro/files/19568290395.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161432adcecb5b---zevivogejulalotojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=forest+run+gamePDF 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_off0000cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 18156 bytes
SHA-256: 96798f57b49d674fe2cf61a6a0c469f2f500c03796b29822f7c1bf79db8742bb
font_01_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 10388 bytes
SHA-256: 97c07c27efa79f3bbf77ed9f9957ac1d99779b9a28362b3e4edc1f3172c460ca
font_02_sfnt_off0001150c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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