Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e951f5806556ffd…

MALICIOUS

PDF

84.2 KB Created: 2021-04-01 04:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 279619c41ab8d4c0e2709af76615b0f9 SHA-1: 503bf8cd306e14417cb86bb0f90a2536f2e7e67d SHA-256: 8e951f5806556ffd23af50082da394ccf9b243270c98ad61a09c354deddb5f8a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/aws?utm_term=self+mastery+tips PDF link annotation
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/gewexegobuka.pdfIn PDF document text
    • http://zutalinezar.iblogger.org/fl_studio_vs_ableton_hip_hop.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/gu0jfp2/catapult_quest_mod_apk.pdfIn PDF document text
    • http://magic-world.site/nugijinelavukopebuxodawanqwgu2.pdfIn PDF document text
    • http://rankingcoach-apps.com/walmart_black_friday_ps5_restock_timesalbkt.pdfIn PDF document text
    • http://7gusevshop.space/ielts_reading_test_exampleamf06.pdfIn PDF document text
    • http://sokadap.22web.org/aggregate_planning_solved_examples.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/5ed6588.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/gCii6kj/bokewevodif.pdfIn PDF document text
    • https://zovejesuvenej.weebly.com/uploads/1/3/1/4/131438366/072660.pdfIn PDF document text
    • https://guzebiba.weebly.com/uploads/1/3/4/3/134368687/1376137.pdfIn PDF document text
    • https://jesebumu.weebly.com/uploads/1/3/4/6/134617302/puderuga.pdfIn PDF document text
    • http://mif-smeh.space/muzadoliisj05.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/7jMic4Z/letasoft_sound_booster_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jefobexapulow/android_version_7._0_update.pdfIn PDF document text
    • http://boromepi.rf.gd/nodeveburuzugilexepiw.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_bc57e1a45e224de8804cce90b1ad0eac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/kelvinator_air_conditioner_manual_n216.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_02f8a86a24aa4e9c9f46b59d58cb6470.pdf?index=trueIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_1d52ec49a42444378e84630879b0342f.pdf?index=trueIn PDF document text
    • http://zefifimagami.epizy.com/minajorifiwesosupan.pdfIn PDF document text
    • http://pojuzed.rf.gd/73394018891.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/cerebral_edema_management.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 4824 bytes
SHA-256: 85e5aa4e6de5a61cd17e8dd08bbd6eac98b045b1ba2c984f38b29d6ccd09b743
font_01_sfnt_off00010ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 10932 bytes
SHA-256: da112ae6491410038cbd0fe286e8a453a36708c51e2e12ec64b80b48e8032d89
font_02_sfnt_off000133d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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