Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70b8ea560f75c50…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 02:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd68e7eb8fd443f02322dfabe1783d0d SHA-1: 016501f42b643f64d4727e37a8d362ee98e3810e SHA-256: c70b8ea560f75c5034ba059383adbf5198731368794aba1fa6130d390d6f2fe5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links, many of which are on disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. One prominent URL, 'https://medvor.ru/uplcv?utm_term=gta+5+game+for+android+free+download+apk', is presented as a lure for a game download, likely leading to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=gta+5+game+for+android+free+download+apk PDF link annotation
    • http://debten.net/UserFiles/File/36559320397.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210902_EE6A9FBED3AB59CB.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/71886757041.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/82322549748.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/xebijew.pdfIn PDF document text
    • http://sinoorchids.com/image/file/50740763451.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/vuguve.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/panizo.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/zunewixezitafodupedebepu.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/94745941297.pdfIn PDF document text
    • http://leguido.net/files/50615038330.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/v658q2s3ko1ht6ftqkqcl8cc41/tunigoxezalobif.pdfIn PDF document text
    • https://x-software.cz/data/file/88710935479.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/36118317602.pdfIn PDF document text
    • https://sardiniagreencoast.com/userfiles/file/buwunowelaxirijosifuven.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/78004427649.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/90060498288.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/49951425705.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/16944530619.pdfIn PDF document text
    • https://wittnebel.dk/file/86015872141.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141c4c157e77---49051617389.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/sukobatafonasosotixexigiv.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/dujim.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_off0000dd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 17808 bytes
SHA-256: 0bd2646dc3585ebdd262429c1f11cc8aa1cea3184c036b743931254b388f0019
font_02_sfnt_off000123fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 11024 bytes
SHA-256: 41346b81d903a4c59776444ab5b2a5636054bb56fd9fc43c39715001c463c4da