Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b36ebbe60d00d78…

MALICIOUS

PDF

95.9 KB Created: 2021-09-17 02:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 570cc55382d4ea3e9910373ae5d01bf3 SHA-1: 3e846d2ac6a618ce0ea7f16c2ff1aea00777ed29 SHA-256: 6b36ebbe60d00d78590f805489e7c21101cb22ad36c091c1c65ca4c324a94ce8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to disposable hosting and are likely used for phishing or to redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to exploit users by directing them to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://wastran.ru/uplcv?utm_term=kanale+shqip+falas
    • https://atlanticcompact.org/userfiles/files/kezavotimilozigo.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161329a370c16f---13229846584.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/92256878630.pdf
    • http://druckmaschinenservice.com/uploads/fce/files/munozikazikipogudupozomel.pdf
    • http://tamtamphat.com/upload/files/tutixajifexepujuburorefu.pdf
    • http://hbisan.com/userfiles/file/suxijomalizomuketos.pdf
    • https://cnn-logistics.com/asset/files/livawipejugosot.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece52e05a4---58997404313.pdf
    • http://shinaval.ru/userfiles/file/ketikibuvevoxob.pdf
    • http://ahlhy.com/uploads/file/162257022422.pdf
    • http://abwnickersonplaza.com/uploads/files/gevidamexuwupagikev.pdf
    • http://netdepphunu.vn/images/userfiles/file/faxel.pdf
    • https://heureka-cz.eu/files/zixewu.pdf
    • http://nirmalapublicschoolerumely.com/userfiles/file/70927068376.pdf
    • http://brcassociati.com/userfiles/files/mosutovukorakolute.pdf
    • https://machinex-machines.com/UserFiles/File/vowezud.pdf
    • http://sys-svinding.dk/userfiles/file/74262350695.pdf
    • http://dinhvi5s.com/images/newtech/files/rulevepomufodijito.pdf
    • https://susta.vn/userfiles/file/68927129406.pdf
    • https://aynadakikemalizm.com/resimler/files/45785545002.pdf
    • http://autohondl.cz/userfiles/file/gakenel.pdf
    • https://zohopin.com/calisma2/files/uploads/44743111750.pdf
    • http://krcatikyonetimi.com/userfiles/file/56637814328.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ffea.bin
7d3c4cdaa01e4250c9dc4216f416508bd394a272893e1bebdbfb29a06a65d2f4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFFEA 23800 bytes
font_00_sfnt_off0000e8f4.bin
8b94a2a343f61747a62889d8c909c8946ad3f6e994b9a1db3b615d6190417d85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 10272 bytes
font_02_sfnt_off00012a61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A61 16792 bytes
font_03_sfnt_off00014273.bin
5f45cb92758e9a6ad7ffc5ebf7f49b7be7b1ba9ee287b7bce4950e08a11125f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14273 18452 bytes

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