Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4eb40a35a42b85…

MALICIOUS

PDF

86.2 KB Created: 2021-05-30 09:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 257e846c9fc58ed0a073bd5c4ee080fd SHA-1: dd547089821281c40bdc8b0d5a22310f6c42c2dd SHA-256: ba4eb40a35a42b851321570dad9555121b3555f96dbbf8447cab8acc1c1b4d54
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/123?utm_term=apa+format+example+multiple+authors PDF link annotation
    • https://zemedefikejo.weebly.com/uploads/1/3/4/0/134040876/sodujatazilume.pdfIn PDF document text
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/6417882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_601b23f5c2b60.pdfIn PDF document text
    • https://gubipixuzubuf.weebly.com/uploads/1/3/4/0/134016682/2449806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445534/normal_600aaac30fb55.pdfIn PDF document text
    • https://pekubitox.weebly.com/uploads/1/3/4/4/134477952/jefegozoweji.pdfIn PDF document text
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/1238740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_6024c21f80b6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_6029ded69c9c1.pdfIn PDF document text
    • https://vipamabukaxeban.weebly.com/uploads/1/3/0/8/130874648/ziragopemugi.pdfIn PDF document text
    • https://wemovimezatura.weebly.com/uploads/1/3/4/6/134611727/wokutomakilu.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/buvudukililu_lakap_wujamujos_lulamotix.pdfIn PDF document text
    • https://fajevubesupuvax.weebly.com/uploads/1/3/5/3/135387480/76961bb6f506e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_604d7bfecb243.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446647/normal_5fceab1ba4887.pdfIn PDF document text
    • https://nakubinigana.weebly.com/uploads/1/3/1/3/131379761/6546629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419826/normal_606dc8c54abec.pdfIn PDF document text
    • https://jitoxazenop.weebly.com/uploads/1/3/4/5/134588357/sikuxumijenuvekis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_60196cffb6071.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465259/normal_5fcdff5399afb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498348/normal_6028ba105300a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5ffe8e1fae30c.pdfIn PDF document text
    • https://giwaxevo.weebly.com/uploads/1/3/4/6/134644090/686291c7d04.pdfIn PDF document text
    • https://kigijizinelojuk.weebly.com/uploads/1/3/4/8/134848952/tisaxe.pdfIn PDF document text
    • https://sezunugavekavo.weebly.com/uploads/1/3/5/3/135321765/lusafamejizevav-gipokixidiba-babofeputu.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/9703877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_603fd4cb0f7c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 5196 bytes
SHA-256: ebd1ce0ae51d324737e21f6db48a3756a7da699798d643ac241fae1abbc65772
font_01_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 11788 bytes
SHA-256: 99af7c9849df772fcf9d1c47e488be1190053d70184547fe002a57fd265543a3
font_02_sfnt_off0001357b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357B 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15