Malicious PDF — malware analysis report

Static analysis result for SHA-256 911789e044cd89a8…

MALICIOUS

PDF

81.1 KB Created: 2021-04-01 21:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a63c1d21780ca677c1414d04009c0a05 SHA-1: e904ee22bccdc889a258aae0a2540f7ed33106d4 SHA-256: 911789e044cd89a864032780d84bf5ea6bba8474f6395b23151cd12c26baf0a1
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 0.9993

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://seumenha.ru/123?utm_term=android+developer+jobs+in+pune+salary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469106/normal_5fec432199b50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451955/normal_5fdd0c54423a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497093/normal_5fccda33904cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425506/normal_60518459dd58a.pdfIn PDF document text
    • http://nemagufi.mywebcommunity.org/59517646430.pdfIn PDF document text
    • http://jidokove.scienceontheweb.net/distribucion_binomial_negativa_ejemplos.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/raymarine_c80_radar_dome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450864/normal_605a3f3964da1.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/40617897166.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bedigetulo.epizy.com/fizupulowerepotuxinaz.pdfIn PDF document text
    • http://bexituxupogetav.rf.gd/namafot.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_a1e9d5059dd44509b8b4fdd3dd611872.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nigimul/derivatives_of_trig_functions_worksheet_with_answers.pdfIn PDF document text
    • http://xafonabikox.rf.gd/sobetuxumatuvosubinefi.pdfIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_8fa1c712575049368e46d4b838e930dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/what_is_the_relative_location_of_canada.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_2c9cbabcbdc44e6992175d944e0c447c.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_b231a6faa8e94247aebf915711e29c71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/batiku/bassoon_sheet_music_super_mario.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/57096960093.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/exempt_reportable_fringe_benefits_child_support.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/schumacher_xc103w_battery_charger.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_03ebe80efae54f37935610c7814e5aae.pdf?index=trueIn PDF document text
    • https://ce722411-b424-48ee-ac00-b4ed8818edd9.filesusr.com/ugd/bff0de_c6fab4b2519d4663879b5c729db04550.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 5320 bytes
SHA-256: 672cc7ebf4e07ab3b2b89aac7531f616f3713e0b5f2977c9c70689e9dd2883cb
font_01_sfnt_off00010f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 11680 bytes
SHA-256: 468b091da760699572533ea606c29fd3b07e20fee76e474fc656885073f238c7

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