Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4e8defad3d246a…

MALICIOUS

PDF

69.6 KB Created: 2021-09-09 02:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 088fcaae1138d50a6279a974fa3b4537 SHA-1: 142c0c1d1382398ca3a76b25454feb3833055852 SHA-256: 8c4e8defad3d246af1a22b3ce6df1f03b45dc1eaf075706682ba5ba1253b8100
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly suggest malicious intent. The primary URL points to a lure for downloading a hacked game, likely a pretext for delivering a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=gta+vice+city+hacked+apk PDF link annotation
    • http://9262895.ru/ckfinder/userfiles/files/39057090894.pdfIn PDF document text
    • https://jck.ro/userfiles/file/42875653599.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109062317305393.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/xupavexojemisola.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/lisabarivigikaxevejevesik.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/topoxejepi.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/14653714904.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/48292995888.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/5237718167.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136effa9f1bb---pujadizanuv.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/jezudesakazefitarolenu.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/45584000983.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310ea96f7d1---bikaranibum.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/kabarebiz.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/93144424649.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/69105851292.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/857364235.pdfIn PDF document text
    • https://loyd.rs/images/file/81044981282.pdfIn PDF document text
    • http://artio.pl/files/files/pukajoxa.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/1890546494.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/koditu.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/29546115555.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/30098047678.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/11614970674.pdfIn PDF document text
    • http://centronegozi.com/public/78725185285.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/68059637430.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_off0000b2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 15196 bytes
SHA-256: 5c2a97644bd33a5aa1da34563d6baa79e66d0d2deb57dba3169bd67452068d65
font_02_sfnt_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 10384 bytes
SHA-256: d3ef87b90a12d65ff8774682a0c8738e6b79e5b51f6dcababdbabd0e1bad0275