Malicious PDF — malware analysis report

Static analysis result for SHA-256 60db5d68d89fc2bb…

MALICIOUS

PDF

85.5 KB Created: 2021-10-05 04:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4dcb7eb83ec4c6b639e7ba8ed904348e SHA-1: 53f56da15179bd3b614b7f4219ecd53cd93972f8 SHA-256: 60db5d68d89fc2bb775044ff7008581cc1c7729b15b5efb247505fc7705d6682
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the PDF is part of a link farm designed to host multiple disposable links, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the heuristics and the detection name point towards a phishing or trojan delivery mechanism, potentially involving embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d7c1397e03486b2fd0fb20b44a2fd7ff/niletizorevezubenasozov.pdf In PDF document text
    • http://www.520amis.com/upload/files/jifasuxajojirolovitifori.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/65720885597.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/wewilomilodewijozifuxu.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/88513027065.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/kagajewajo.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/29656552740.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/1346819725614965cd4c773.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/43417767931.pdfIn PDF document text
    • http://iviltra.lt/images/files/82781595368.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/vujodewovurozujatiwanito.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210914/16315784339112.pdfIn PDF document text
    • http://nemochem.cn/upload/files/godagikigepafuwakobu.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091621571342.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/werudasufuf.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec57b9d270---zopenovabalodolekezik.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/29098057702.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/nibusumore.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/jupuriga.pdfIn PDF document text
    • http://budget-pl.com/ckfinder/userfiles/files/sibaliguwixigotugadoxuwa.pdfIn PDF document text
    • https://hgb.se/filer/file/64981738361.pdfIn PDF document text
    • http://sanjarbek.uz/userfiles/file/putufop.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/raforipovunaranerixosoj.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/tamux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+does+compare+meanPDF 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_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 10632 bytes
SHA-256: 45f616ab497f5aa9f04b6f573cdb39f55ff68b2648c437509dbc40a49e70dd66
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBD 16624 bytes
SHA-256: b932355e1d0e7343c3609fa75866d3f0649e94dee511ea008e9ff3a05b5ac455