Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9d5808080fc3e3…

MALICIOUS

PDF

74.9 KB Created: 2021-03-08 02:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 21518be8d554c83ed5eb98cf065a4251 SHA-1: f489b32759d6458237da74a1c31eb60faf0d9e08 SHA-256: 5f9d5808080fc3e306ce00dc71244a479bd14f03f2b4358c250dc2c8f1522b39
166 Risk Score

Malware Insights

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

This PDF sample was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains references to drawing and wkhtmltopdf, suggesting a lure. The presence of numerous embedded URLs, many pointing to disposable hosting and link farms, indicates an attempt to redirect users to malicious content or download further stages. The 'Password-protected archive handoff' heuristic suggests a common tactic to bypass security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://xajibur.ru/123?utm_term=how+can+i+get+better+at+drawing PDF link annotation
    • http://japadeja.22web.org/how_to_start_writing_a_fiction_book.pdfIn PDF document text
    • http://gonugotez.22web.org/kasatunebevenuforikubiw.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/school_counselor_personal_mission_statement_examples7mutr.pdfIn PDF document text
    • http://vujonaxujutuzo.22web.org/1037170989.pdfIn PDF document text
    • http://polfact.site/27846952303boo2p.pdfIn PDF document text
    • http://wowogobofomufu.mygamesonline.org/sbg6782-ac_forgot_password.pdfIn PDF document text
    • http://lulumel.66ghz.com/72297751854.pdfIn PDF document text
    • http://sfr-espace.best/crosley_fawn_cruiser_bluetooth_record_player_review4tbui.pdfIn PDF document text
    • http://strahuemsya.info/gevabonefuzawuwigodifnifsl.pdfIn PDF document text
    • http://vehicleinsusa.com/kapirirxemyh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_6042ca4896cbf.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/an_enquiry_concerning_human_understanding_section_7_summary.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/how_to_learn_graphic_design_at_home_in_hindi.pdfIn PDF document text
    • http://xubajur.mygamesonline.org/how_to_reset_infrared_thermometer_ck-t1501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_60149e8ce4d35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://panurimo.epizy.com/antonyms_worksheets_for_grade_1.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/mokulalorozete.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_8d47f5798a01403094a8b0cb8770e148.pdf?index=trueIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_c46ae4989aa34503b5aaa23c817d7112.pdf?index=trueIn PDF document text
    • http://fuxalobel.rf.gd/97338377895.pdfIn PDF document text
    • http://welididoseburiv.epizy.com/que_es_el_analisis_marginal.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_157738ad68c445b79abf3479db33d5e9.pdf?index=trueIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_75ef5d96282243fa8c48e98246c9cf5a.pdf?index=trueIn PDF document text
    • http://fewetero.epizy.com/57220389935.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_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 5088 bytes
SHA-256: 838f027a2d6e26b3130f9498e7de660862db50a7cf61ad3f9ec99d266ac503e4
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 10136 bytes
SHA-256: cd86c2fb4d3daba5373a4f77639fe44aa57d78ed5d5ced20347bf0e8263fe857

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