Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c5eb3a00986556…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 16:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d067c764ca09b13f1163b3da439ca0f SHA-1: 91380897ff99b155f4972a5563d0c2878825a0f9 SHA-256: 45c5eb3a009865561a1868fd779e35b04d63a25393a3343e56250bfacaf7bb21
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The embedded URI points to 'garglob.ru', which is likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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.
  • 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://garglob.ru/uplcv?utm_term=rokkr+download+pc+32+bit PDF link annotation
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/7425552988.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/42244155151.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/79456864766.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/59802040051.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/zawuxuxot.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/67688221164.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/98872444166.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/21670056635.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/42870917146.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/surasuvizesetu.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/jurelokukemefidizejijav.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/junevevatuleburota.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/wesorumixojojip.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/xixupirixerubelamugikoseb.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/vividozuzivupajotezubivor.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/16089006189.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/70961305680.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/bixupepominiralivixezokom.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/27175330940.pdfIn PDF document text
    • http://apismorava.eu/docs/50402030264.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/kabamu.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_off0000d270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD270 10864 bytes
SHA-256: 8469a18f0e78fc08e9e0c0977a477a0d314a23d6dc962f52022f90b2a8f0bba5
font_01_sfnt_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 18316 bytes
SHA-256: 318e3dd0e2e6141d2975441bd140d37901e243a663fcfb64f1f8f1f17ce48a2e
font_02_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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