Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea41749b0cf36bcb…

MALICIOUS

PDF

103.9 KB Created: 2021-03-13 20:32:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bcc44b403ddcdf70b52ef46510745376 SHA-1: d7420e3073a8a17a40f4989f602f07aacff8d2bb SHA-256: ea41749b0cf36bcbdfa5da51b27161b56f30b1c181848946600c2f4b8a195846
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one specifically pointing to 'ponafet.ru/award'. Heuristics indicate this PDF acts as a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/award?keyword=rational+emotive+behavior+therapy+techniques+pdf PDF link annotation
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/dugawawexodemasawig.pdfIn PDF document text
    • http://tozaworewinox.mywebcommunity.org/33682328321.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/multiplication_of_fractions_worksheets_grade_6.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/94886328925.pdfIn PDF document text
    • https://xemilesexevig.weebly.com/uploads/1/3/4/2/134266110/dupirapeb_nitivoxugid_roziroxojuwabob.pdfIn PDF document text
    • https://cdn.sqhk.co/sefibenip/ggNibzO/photo_to_video_song_maker_apk.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/92f5897.pdfIn PDF document text
    • http://jupizuginilumop.22web.org/paises_hispanohablantes_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/1Fylzgf/thrift_stores_long_island_suffolk_county.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/19f826e67c9.pdfIn PDF document text
    • https://sudikefasegez.weebly.com/uploads/1/3/1/0/131070357/dubawe.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/optochemical_nanosensors.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/89353096047.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/welanisowari/earth_rotation_worksheet_5th_grade.pdfIn PDF document text
    • http://xutenasejubibe.atwebpages.com/36934106036.pdfIn PDF document text
    • http://warunegiluj.rf.gd/apprendre_l_anglais_facilement_et_gratuitement.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/how_to_use_one_touch_blood_sugar_monitor.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/misavifakosu.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/format_of_accounts_for_central_autonomous_bodies.pdfIn PDF document text
    • http://vedulojut.epizy.com/blame_movie_anime.pdfIn PDF document text
    • http://ravuxigud.epizy.com/begojotunudizobudomil.pdfIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/cochon_d_inde_alimentation.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_off000156e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E2 5832 bytes
SHA-256: c083fa4f0898fcf23da014605405ca96dc16ca461a4b0107d052393ab6e1e202
font_01_sfnt_off00016a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A9D 11412 bytes
SHA-256: af80da714ce1178e37fddd62f89273021cd6fef40611c84c093e3d8b0552ed0f

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