Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f00695eb625f8b…

MALICIOUS

PDF

73.7 KB Created: 2021-02-11 14:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4bdce5dd00ed175f9ff89d6136386c03 SHA-1: 0dfb4f0408d0b657dd458dc708700e54484fab93 SHA-256: f4f00695eb625f8b99614ba56bc611d95e0c2e53c0f677f2cc03bc9e3cedfd28
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://jacksth.ru/aws?utm_term=canadian+fuel+consumption+guide+2016 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412158/normal_5fd86d6ed782c.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/9fcdc19c65.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/JmBCjjl/11225972819.pdfIn PDF document text
    • http://organicsss.space/pekemonip4rrbj.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/ifgfujc/gulanoxugoxenamumazum.pdfIn PDF document text
    • http://pimadukemaxi.22web.org/android_16_last_words.pdfIn PDF document text
    • https://zinebarovug.weebly.com/uploads/1/3/0/8/130814534/mazotuzesi-navetewat.pdfIn PDF document text
    • http://teasmall.space/free_business_plan_startup_templatenr14u.pdfIn PDF document text
    • https://cdn.sqhk.co/rowubuvuke/fbgjphf/7870764865.pdfIn PDF document text
    • https://mudabomem.weebly.com/uploads/1/3/0/9/130969182/c2813d59295ad0.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/gamoselobisoriwuf.pdfIn PDF document text
    • http://kellys.space/3828970469i565f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://folizel.epizy.com/dusirevaf.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/devirazovitobusi.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/chalta_hai_koi_nahi.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/rimesufajonid.pdfIn PDF document text
    • http://varunogozanog.rf.gd/bootstrap_3_blog_templates_free.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 5764 bytes
SHA-256: ceaa26ce5893a03f88f76e127f9f1a35c05032d237ea8c54e76f091b03ee5e87
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 11108 bytes
SHA-256: 2f36e6596c210073261dff377bedc4847d271de3911170ca5f888154d7322342

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