Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a7788ed811226b…

MALICIOUS

PDF

79.4 KB Created: 2021-03-18 03:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5da24c1a4a255a332e735261a36db71f SHA-1: 8d349f403b54541ea53733ee2b5ec6aebe32be62 SHA-256: c5a7788ed811226b599619e60ecde6d83c8272171cfff1da07a85cf893e1e1a7
134 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. It uses an urgency-based lure. 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 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/award?keyword=cauda+equina+syndrome+patient+pdf PDF link annotation
    • http://nugawijuxuv.mywebcommunity.org/72226268240.pdfIn PDF document text
    • http://antonioit.space/95282250673sdlr4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_60236555906f9.pdfIn PDF document text
    • http://kitukotobov.medianewsonline.com/little_house_on_the_prairie_the_last_farewell_full_episode_youtube.pdfIn PDF document text
    • http://kyrgyztours.com/what_are_the_safety_requirements_for_a_boate5rv1.pdfIn PDF document text
    • http://fabimepela.22web.org/kutikijifawivuz.pdfIn PDF document text
    • http://vaworudewu.iblogger.org/61750439485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_602221562192a.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/pseudo_affinity_chromatography.pdfIn PDF document text
    • http://polanuredun.iblogger.org/infinite_warfare_zombies_spaceland_guide.pdfIn PDF document text
    • http://stc-l.ru/death_race_3_torrentkqhtb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_602acc53caae8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_5ae29643746b43b1bfd878e0c3a3cdda.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_6423554040234e76935c6581939de433.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/treasurer_s_report_excel_spreadsheet.pdfIn PDF document text
    • http://xaxotatizomeno.rf.gd/blur_photo_background_android_app.pdfIn PDF document text
    • http://gejaran.epizy.com/goxalaludusemanobemuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/chrome_bookmark_android_home_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/audio_songs_in_telugu_free.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_fd26f4b7cec7477e9f70e43a599e30be.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 5288 bytes
SHA-256: ac3fb39f91ce38b74fa0a1e08c1dc7a5ee1ab7aeeaea8de97d83774d31bc1a22
font_01_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 11184 bytes
SHA-256: 8c5aef85e61d2e65b3bd8c0e4079aa671cbbb854de0a005474eaac8792102dab

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