Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e986772ad02fe5c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 08:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e48f49bd2ddb9981b58a73418921d668 SHA-1: dc81f6a6879a2c65fb658a22cbd48cc10961fbbd SHA-256: 6e986772ad02fe5c1ba74e1a517bc45c9f6f2ab35dcdf0b742145c98ef0c427d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests these links are intended to obscure the true malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://pincodehub.in/userfiles/file/91192985130.pdf In PDF document text
    • http://purofirstli.net/userfiles/file/sesetekonawolemogol.pdfIn PDF document text
    • http://thaide.org/userfiles/file/38357265608.pdfIn PDF document text
    • http://gr-chem.com/upload/files/59745794255.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/47839321987.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/gepugemituragubozifalif.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/navasuxedukejaputuri.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/xukuzode.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/29720019825.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/c874c05f5d8b6aebf9a111b6be02d53a/90712642369.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/lumorago.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/93220709421.pdfIn PDF document text
    • http://exim5.hu/_user/file/raxorakogarejunige.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/86592780792.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/47867302689.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/90896972159.pdfIn PDF document text
    • https://ccskin.com/geektic/files/xenilobekoleg.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/jumofusab.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/gururosaxejul.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/diloxonorufarufufi.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/95860168300.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109061303199879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=turbo+stars+mod+apkPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFD 10476 bytes
SHA-256: 4a90205bc6d35fa805c449889ecf428d5718516ced0d83de20365cfd9a97e0a7
font_01_sfnt_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 19368 bytes
SHA-256: 6ac86e9f01c1dcfb1a36cb1144357558d433b85c4fd28b30bcc9d00e9955bebc
font_02_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 16104 bytes
SHA-256: f06cddf61c9925e39e47a8b8d88d5d2c108808d867bf63b528aab798a6fb49b7

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