Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4d19e62c096aec…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 21:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7839ed994c5f902a6706b24251274a8b SHA-1: 17ab2bedfc894fc78df12569ccd02d81c4f357d8 SHA-256: 8c4d19e62c096aeca63f44d47f09e1562c910129aa00e8474964a12323d3e481
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://familie-schiecke.de/images/file/xitakawawopam.pdf In PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/zerekabivumolujigemegowi.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/27095887700.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/depolefuxemub.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/3187546820.pdfIn PDF document text
    • https://kultmotor.hu/images/files/jevamotinafemafoxo.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/20509153744.pdfIn PDF document text
    • https://luminex.pl/upload/file/62998076590.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/xesabekiluvenanibosag.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/weladozobu.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/besopowonililesarurivid.pdfIn PDF document text
    • https://angem.fr/userfiles/file/4353639621.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/91208740160.pdfIn PDF document text
    • http://markone-tools.com/upload/files/nisapixuwobifenonaxonuve.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/gikezi.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/56482484995.pdfIn PDF document text
    • http://corkpotters.com/images/71954740883.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/fexegakasogogisuzoxo.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/kolupef.pdfIn PDF document text
    • http://esistore.be/userfiles/file/71149849472.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/e2pq3lqpjrfeu9smp8u0gdqhk6/38179335860.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210905055227.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/60376077851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=among+us+ios+voice+chatPDF 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_off0000d05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05B 17452 bytes
SHA-256: b4bda3bdbc2f93670f3395039e8579054cf1e8407488b5aeb7afcd0cecb27f2c
font_01_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 10680 bytes
SHA-256: 04f06e597630b8ab690a2a12f1f734b45a539e556549bda8689530fb008c75f4
font_02_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1