Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e60319b6dea727…

MALICIOUS

PDF

80.8 KB Created: 2021-10-08 06:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d714c4f50b6e6772804ca29fa3ee57fd SHA-1: 05ce1326858ddc8861009393e483ac08c5f1c8f0 SHA-256: e4e60319b6dea727bd6f1ef1976633d1acbe999eaf8ca6b4a0900cbf317836c1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The PDF also contains numerous external URIs, many of which are part of a link farm, suggesting an attempt to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=speed+1994+full+movie+free+download+mp4 PDF link annotation
    • https://patriciogaete.com/upload/file/tenesamu.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/69634462742.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/lesivor.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/mejimatifakukafulidumesu.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/jitivi.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/bimijixonorebomumuviluki.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/lerugejukiwasokareno.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/18256441898.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/56963089899.pdfIn PDF document text
    • https://clove7.com/userfiles/file/11411680648.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/26704105374.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/sasuparogarix.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/vurepelifepukogareju.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/jiponimevekax.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/wogamo.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/75764867514.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/73633351836.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/60461925141.pdfIn PDF document text
    • http://cbstav.cz/file/39960779430.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/92083949565.pdfIn PDF document text
    • http://teknis.it/userfiles/files/45151730020.pdfIn PDF document text
    • http://qdcmd.com/data/files/tuvodagojumedowifo.pdfIn PDF document text
    • http://artio.pl/files/files/wokorifula.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_off0000d353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 18476 bytes
SHA-256: a8564a1a8c878294f2ee0bbe7ddd928f87ee80bae51f7ea1bb7aa6d72e1041bd
font_01_sfnt_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 11020 bytes
SHA-256: da3cbb4496e3bd595d83cb86c9eae5b62f640bff303ad05ea829569d4ade3a47
font_02_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1