Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a81d7eefb03f589…

MALICIOUS

PDF

91.0 KB Created: 2021-03-21 00:12:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c5ed5ffdc00151321f409018badb007c SHA-1: 8b5cdef5ba9f0f469cde4d50264b7ebbfd234e38 SHA-256: 7a81d7eefb03f5893cfe984a44e017f047a2a45fc1d5c7d040895a4a1f60f48d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting services, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though obfuscated, references a license agreement template, likely a lure to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/123?utm_term=cloud+software+license+agreement+template PDF link annotation
    • https://cdn.sqhk.co/jebozibiru/hhbyjhC/hype_city_idle_tycoon_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/keic3gg/zolabuneradovus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_600ada5868ea8.pdfIn PDF document text
    • http://ecoservice-vlad.ru/the_new_leaders_100-day_action_planjtq6o.pdfIn PDF document text
    • http://bbflowers.net/23317844271ldc2f.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/Ujhqjdl/procurement_manager_interview_questions_and_answers.pdfIn PDF document text
    • http://autoupgrade.website/lirik_lagu_cant_stop_the_feeling_trollss3rsz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447433/normal_6048d12b95d77.pdfIn PDF document text
    • https://cdn.sqhk.co/wubukuxivupe/zhaighj/lorugovefotuvegawiv.pdfIn PDF document text
    • http://starkrobotics.org/galajomarevasu294o1.pdfIn PDF document text
    • http://fsbsiod.com/kilapadopanujaam43h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459921/normal_5fe76bd200a7f.pdfIn PDF document text
    • http://baffer-shop.space/858673586095ch3w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5fced0a67dce4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5ff4cc8eabb9f.pdfIn PDF document text
    • http://amst-watch-v1.club/credit_agricole_cib_paris_annual_report_2017j8574.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolupenilu/igihggz/notepad_plus_plus_alternative_for_linux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_279af4151c1a46c7a5e608d3b7c71d4e.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_723cfda188ea488b9a05050da6a23ee7.pdf?index=trueIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_461053a1461d467188cd09794b300f04.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_4c79ecaa23e34d28a522e336d602416c.pdf?index=trueIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_33e42c78608b438e886bc9301131cb4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miledu/cara_vsco_x_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/77480957991.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_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 5472 bytes
SHA-256: e1801a70f018365e9af28906d51fbccfbdc8e6cf18b5eea592cdafd752008e73
font_01_sfnt_off00013660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13660 11804 bytes
SHA-256: 240ac18e2e44b2f9bc276357fc072385f66d21798f4877a01bdfe30fd0215329

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