Malicious PDF — malware analysis report

Static analysis result for SHA-256 517e2ae084499658…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 23:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f280dda1e1db54a47c40ea335ab788f2 SHA-1: 9f918909d63ee558d4258673063f077882e0e4e5 SHA-256: 517e2ae084499658df7ebc88a813f99f3e09ceac3d65d9a025f4d9548f42cef5
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://newo.ru/files/files/wepetodetowibukuteriw.pdf In PDF document text
    • http://studioguatta.it/userfiles/files/59662703076.pdfIn PDF document text
    • https://conrays.ru/f/data/sexusavevawovawi.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/garilujoxovefizuwix.pdfIn PDF document text
    • http://partnercable.hu/files/29618184814.pdfIn PDF document text
    • http://thepducphat.com/upload/files/wadema.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/83688142045.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/19866888255.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/43805249028.pdfIn PDF document text
    • https://drgcode.managenet.ro/images/file/gakaguzaseketugobimu.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/wavefamilaba.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/joleniluvevezi.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/kovagerojataripilafuf.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/3167656791.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109181224056365.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613509e30da42---zijoraxuvezomokerorosa.pdfIn PDF document text
    • http://perksys.com/userfiles/file/vinorul.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/57112193829.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/86924991316.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/93217239785.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/20161553844.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/41599282612.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/tuvokezifodunewuzimusir.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/ruwazozen.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/lamup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+tabs+libraryPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE2 10344 bytes
SHA-256: bfa91f5bbc6ed11358a2c2ec7eb6b816c4378a85081e06d34d4bb1caf33ce089
font_01_sfnt_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 18104 bytes
SHA-256: 67cefe8035464d7a68ea17f6fb1fc8270336224fad823ae0de1c1e3be0b3b83b