Malicious PDF — malware analysis report

Static analysis result for SHA-256 2097dbca9ed023b6…

MALICIOUS

PDF

69.8 KB Created: 2021-09-22 19:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0189c58207e84caeb53e67c38247cab SHA-1: eedc2586387d5d4b678ca9b0d8c9c9da0c330ed1 SHA-256: 2097dbca9ed023b6d9879fa3298bd4ac452ba7d2994948203dbce17f48710322
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=angry+birds+2+mod+apk PDF link annotation
    • https://dildendilecevirievi.com/upload/ckfinder/files/39008071559.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/33971823400.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/felozif.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/45379455730.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/26066714666.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/vozagovukuvazosanog.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/tebutufatuxomudurafi.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/11977123276.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/97599683440.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/59228005394.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/melalosudepatizinedo.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/gisanukabijedevipujit.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/17166467073.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/xuzabasogizifosalawetut.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/lamesuresosesex.pdfIn PDF document text
    • http://sinners-party.de/media/file/15490713523.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/2403226739.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/57610313396.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/ragipirag.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/nomove.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34849853452.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/93660109763.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_off0000b085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 10904 bytes
SHA-256: b01987bbe9f3576e2a4d53ef89924159d88eab38c7a82b4272c2a5a999c01707
font_02_sfnt_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 15860 bytes
SHA-256: 54e4881b98f7aec17f2917b9c05065f285323e30ee3e9da32b2447da4d0934e6

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