Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e18170dabb07db…

MALICIOUS

PDF

71.3 KB Created: 2021-09-24 18:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e6a6e360e95c43a1f79a6b872ce55db SHA-1: c0d3ea506da9661536e4838fa864fa17e62b337d SHA-256: d5e18170dabb07dbe43ba1b4bc069404aac9d84c6ba89d7cd1005301364ecf4f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and also by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm designed to obscure the true destination. The primary URL suggests a lure for downloading an Android application, likely a phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=pdanet+apk+download+for+android PDF link annotation
    • http://zeguvietnam.com/uploads/ckfinder/files/mirumepunofusokibulezu.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/liwifiwujepezapera.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/gitenopumizisikop.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dbe0919ea---naxovusawarudelesen.pdfIn PDF document text
    • http://asustainable.com/global/file/gafup.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/mujukeparet.pdfIn PDF document text
    • http://adice-area.com/pictures/files/30557626601.pdfIn PDF document text
    • https://thietbigas.net/media/files/68407688594.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/varakodutamanar.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/vatubemuvusubob.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/nuvavipid.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/fovesapar.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///lexumoju.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/22545866750.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/80599402890.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/27784486305.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/levow.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210917043031183.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/wejupimipuv.pdfIn PDF document text
    • https://mkontroll.hu/File/tigipogufujijupaw.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/ginosunetoseweboli.pdfIn PDF document text
    • http://elsped.hu/files/file/1526766685.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613137fd79e71---66352411080.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/vinege.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/kirabegujinira.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/gapasawigas.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/2916635176.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/ganafezumejimutupufuj.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_off0000b40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 16564 bytes
SHA-256: dc519f79b8837dfdbaf1322382277e16c5468ae6c1095460f39b04f887ba24ae
font_02_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 10504 bytes
SHA-256: 49af95bb8889afd063bfe48e54646be56d82dd95c5981b2234282a34388f1911