Malicious PDF — malware analysis report

Static analysis result for SHA-256 be38a68612081962…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 19:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a5a3a5bb756400adbf801170587f200 SHA-1: 87bf445173f459731c9cf7068be65062dd08f0b5 SHA-256: be38a686120819629456b1bdfed1dd6390b4cadebe177872108cc9ee5d7d5fea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to suspicious domains, suggesting a link farm designed to trick users into downloading further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the malicious intent through numerous redirects and disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/vibafutakixanan.pdf
    • http://gurukripapublicschool.org/userfiles/file/57095270548.pdf
    • http://ranahytta.com/ckfinder/userfiles/files/wugoponotaripezamulus.pdf
    • http://www.pranabkumar.com/fckimages/file/45190030705.pdf
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/17445539861.pdf
    • http://affordableadobe.com/ckfinder/userfiles/files/xawujemenetiwiwe.pdf
    • http://cnmrobotics.com/files/files/notanuzezobusumemal.pdf
    • https://lrsdev.com/userfiles/file/vimiwolipasizudekatomosuk.pdf
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/rajivawenowewenogigi.pdf
    • http://energosol.pl/images_cms/file/fazarukufese.pdf
    • http://potya.com/36115030053.pdf
    • http://hiroshima-teishaku.com/userfiles/file/gepurafiw.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fawijor.pdf
    • http://elosc.com/upFile/file///ITX202109041327483042.pdf
    • https://fond.ru/userfiles/file/logowineb.pdf
    • http://asid.rw/userfiles/file/84239073222.pdf
    • http://anhuicrew.com/upload_fck/file/2021-9-2/20210902175538996796.pdf
    • https://workinhotel.com/upload/fckfile/memupodavanis.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4cb9bc085f87c986cffac729b3559e27/43923908522.pdf
    • http://zekidilektekstil.com/images_upload/files/55088837025.pdf
    • http://ei-windykacja.pl/upload/file/44229498168.pdf
    • https://qian-ho.com/upfiles/editor/files/zitobiromibesu.pdf
    • http://snap-drone.com/userfiles/file/99549837599.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=thiruttuvcd+2021+tamil+movies
    • 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_off0000dab8.bin
ac6a9069f63ee8c2e3329dbdfbf29f8dbbf93990613c15f90321ee4552601578		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 10956 bytes
font_01_sfnt_off0000f443.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 16792 bytes
font_02_sfnt_off00010c55.bin
62730f08db8eb603251cfcf8ab7cdf068de1b665d2785b0409d78a5ff1c33e4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 18300 bytes

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