Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8305993f652e680…

MALICIOUS

PDF

77.2 KB Created: 2021-02-02 14:17:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e196414b51eb3b717727b4154df90317 SHA-1: e2ce813431ba41ecf74d15690466e08438f9d036 SHA-256: b8305993f652e6805971dacf29af550a87a4a18604a25ee0fd0ea6ba821ecd83
192 Risk Score
Tags
free-cdn-ebook-manual-lure

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/aws?utm_term=hazard+identification+tool+template In PDF document text
    • http://mugedly.xyz/85634578929l79tp.pdfIn PDF document text
    • http://yesitalia.fun/94777072701ob3br.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/gfjabYa/gutschein_bei_amazon_prime_einlosen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fdec7a98d123.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450511/normal_60041a00569a2.pdfIn PDF document text
    • http://tevfikyuce.xyz/13212900602rhbm4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457560/normal_5fce68df08dec.pdfIn PDF document text
    • http://supportcopyright.net/mujusuviwojaludk7221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_5fdc3d91c0263.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/hijihFU/96418471163.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477409/normal_5fced402e5ed8.pdfIn PDF document text
    • http://therarbooks.com/using_the_quadratic_formula_worksheeay7sv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pavujiniz/digital_multimeter_fluke_179.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/logical_questions_for_quiz_competition_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/credit_limit_worksheet_schedule_r.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/free_bootstrap_templates_responsive_blog.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/60568953074.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 4920 bytes
SHA-256: cd0258887404e2c4212eb80afb915d643328e11232b42a6f5de525f8d2b89594
font_01_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 10800 bytes
SHA-256: 9298fd71eb06a1bcd921450b688a86cc650342d4027551ba348f02a9130b91a3
font_02_sfnt_off000119eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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