Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c372e8b6f0c5e5e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 20:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8cdab3a4bb118a3ef2a2d054e831ee4 SHA-1: 4b93ac3aa877cde4f28bfab0fae744226270be52 SHA-256: 7c372e8b6f0c5e5e4dc1de345d34b0f3a952af22ea3ac2c369c838d53f1dcff6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=arcade+games+king+of+emulator+2+apk PDF link annotation
    • http://auburn-properties.com/userfiles/files/29408681973.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-13/20210913144753127597.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/41937978712.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/lujekurapasexoradiw.pdfIn PDF document text
    • http://ndt-ultratech.com/files/98061256498.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6mbfcjhc31vonq53s6ophvj7gj/gopokaxinuvepavaduzowo.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/vumoxulegaladijatevilusa.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/tomexovusu.pdfIn PDF document text
    • http://sinners-party.de/media/file/gapajodonejotonojivobiwig.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/7670656627.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/37324556951.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/ramorikikogesuxinebibur.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/kenubotojoxewufiwoguropub.pdfIn PDF document text
    • http://carbonelite.ru/file/67007124044.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/jidexu.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/xebabegonobakovajozobaled.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/99973994826.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/fubemuvelexurovanar.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1632048685b42020ee72b0896182.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/susomowu.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/26074972753.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/nugipevirozepadodi.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/14063766207.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/78273913460.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/32104118500.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_off0000b369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB369 15600 bytes
SHA-256: 227517543f937b1912c07876df96c5280d3a6b9af954391b460dd0741238e884
font_01_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 11256 bytes
SHA-256: f5d065d83152cc4c30f06cebc09194cb530315855c9bd2944cb5428bf37fb84b