Malicious PDF — malware analysis report

Static analysis result for SHA-256 747e9c249b7eeb2c…

MALICIOUS

PDF

80.5 KB Created: 2021-04-18 09:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b190efcd5b53a9ce37b2c1fd791dd00 SHA-1: e303fd11b6cf96b3b7f869f32569be24f96e1dcf SHA-256: 747e9c249b7eeb2c6b88c18153e407b9733f4dc724b3d2c42c57af46766af0c6
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are part of a link farm, suggesting a phishing or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the 'Urgency / deadline' heuristic further support a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=tableau+training+classes+online
    • https://cdn-cms.f-static.net/uploads/4415526/normal_6040769ede895.pdf
    • https://static.s123-cdn-static.com/uploads/4372735/normal_5fef0fb2b90d3.pdf
    • http://select-get.top/kojuvibokesodikaxalg5xr.pdf
    • http://devumixik.iblogger.org/schlage_digital_lock_not_working.pdf
    • http://feedbacrnz.space/draw_angles_with_a_protractor_worksheet6w00s.pdf
    • http://kevesojesofun.22web.org/14897564873.pdf
    • http://hot-money.fun/what_kind_of_charger_does_a_galaxy_s5_use6jo92.pdf
    • https://cdn-cms.f-static.net/uploads/4421199/normal_602afdc527112.pdf
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5feb2f1c4b8bc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wufujudisu/topikupuw.pdf
    • https://s3.amazonaws.com/lowebemuwojiso/kagiwedodelifirivapi.pdf
    • https://s3.amazonaws.com/jaloto/coreldraw_x7_setup.pdf
    • http://zukanimi.epizy.com/antonyms_english_words.pdf
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_0d054abbfc234cb4ab1b77af0dff89a5.pdf?index=true
    • http://logasexa.epizy.com/audco_butterfly_valve_catalogue.pdf
    • http://defisatum.epizy.com/the_informant_2009_imdb.pdf
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_5440ba9361364836ad221574ef957c03.pdf?index=true
    • https://s3.amazonaws.com/gatazeromij/whatsapp_web_windows_7.pdf
    • https://0a9d52b7-bae8-445b-b6d2-8eba0f02533c.filesusr.com/ugd/729231_67d7a5540df1400087a7a9d7afe343fb.pdf?index=true
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_3a421ef51bc24b6ea7fd31251ab9758a.pdf?index=true
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_0051cc612e0c44bdba2e89b8777603f8.pdf?index=true
    • https://s3.amazonaws.com/gumagabu/the_woman_in_the_window_1944_streaming.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff0f.bin
8e2a6f61daf1f5993b9b5a3db9af3a30c230d9e564933df159d1b6865596fcf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 5056 bytes
font_01_sfnt_off0001104a.bin
712816bc6b12ef9428ee3e2b2a8a74010794f1a617aeaa38ecf01134417a0cff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 10824 bytes

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