Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba142096a2bc7ce7…

MALICIOUS

PDF

70.7 KB Created: 2021-06-06 10:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1dae7b8b009c41e4d81094ed864201fa SHA-1: 473721dbcad1e912fdf8f2ebbbe0d8d471fbc40a SHA-256: ba142096a2bc7ce797fe6d851b088769b15d8941032266566fa037c1e19026de
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to search engine optimization for PDF downloads, further supporting the phishing or malware distribution pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9410

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 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
  • 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://synerhu.ru/pbw?utm_term=adobe+photoshop+cs6+tutorial+pdf+free+download+bahasa+indonesia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406516/normal_60ba893741568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_60b949134de44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_5fdbe749717d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484126/normal_6006c5eeb712d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_601c02e6b361c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475988/normal_5ffabe2dcfbdf.pdfIn PDF document text
    • https://kitenogoxaginup.weebly.com/uploads/1/3/5/2/135298643/jegisik-jebivi-sinabinu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4388596/normal_60b1e6f11d20f.pdfIn PDF document text
    • https://tutewuvem.weebly.com/uploads/1/3/4/7/134720023/0fab0ac471966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_600cf7d57c826.pdfIn PDF document text
    • https://xixusumer.weebly.com/uploads/1/3/0/8/130814933/af49314e2b5914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489414/normal_601d373b9b2af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcaf55915185.pdfIn PDF document text
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/e47d4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_60bc2b212eaef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/what_are_the_jamb_past_question.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144414549/why_wont_my_indoor_tv_aerial_work.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/f/xanisezolulo.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144417015/1962533707.pdfIn PDF document text
    • http://botinuba.pbworks.com/f/25788680574.pdfIn PDF document text
    • http://panuduxeruv.pbworks.com/f/vomulawuzomujuba.pdfIn PDF document text
    • http://fevuxowina.pbworks.com/f/24580248704.pdfIn PDF document text
    • http://matekid.pbworks.com/f/dokanabe.pdfIn PDF document text
    • http://boxedaw.pbworks.com/f/vasepilulexose.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 5620 bytes
SHA-256: d1c98db2294f8c9c429e17b3af2445aaa1af44f53c1fe1854eeb1f05d675d439
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10060 bytes
SHA-256: 6e4bd97a4efdab9b8fe25a88a8ea8a7b5b81baee8e1e30a3868bb99eb3309adf

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