Malicious PDF — malware analysis report

Static analysis result for SHA-256 904be13807f7992a…

MALICIOUS

PDF

80.5 KB Created: 2021-03-24 03:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c54b3a42441dd0a88f4d886c3fd0da7d SHA-1: 71a2790b2f2039add06aa4fae2b2a6733bb0dedf SHA-256: 904be13807f7992ab77682ad59891618a88782d69720363a7bb181fa131ab819
126 Risk Score

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 0.9995

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://resalured.ru/wix?keyword=informative+essay+outline+high+school PDF link annotation
    • https://cdn.sqhk.co/xinefegepe/hdkgIWj/block_breaker_3_gameloft_apk.pdfIn PDF document text
    • http://icub.tech/can_i_use_my_steering_wheel_controls_with_an_aftermarket_stereo5k4xb.pdfIn PDF document text
    • http://pelubexeto.getenjoyment.net/adestramento_de_ces_para_guarda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_600d3568dab60.pdfIn PDF document text
    • http://goodsfor.life/132374234185lkny.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/qdigeHC/fupetifilaz.pdfIn PDF document text
    • http://legendnat.space/osmosis_and_diffusion_worksheet_middle_schoolhezef.pdfIn PDF document text
    • https://cdn.sqhk.co/betarudigi/ijhiajd/88672821243.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/oracle_sql_certification_cost_in_india.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494868/normal_605a61709b18e.pdfIn PDF document text
    • http://kezujogorep.22web.org/fizat.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/business_management_vocabulary_quizlet.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/ic8ohaw/81179181417.pdfIn PDF document text
    • http://begdas.fun/dirt_devil_power_max_complete_pet_reviewsihsk6.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/place_value_worksheets_grade_5_cbse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379723/normal_601f7e4f2ed1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5fd9bac97e652.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/hhBwphj/xadewabokorezemogoz.pdfIn PDF document text
    • http://belkwigs.com/fodmap_liste_aliments_autoriss0ihwn.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
    • http://zegorekezape.rf.gd/how_to_change_battery_in_reizen_talking_watch.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/block_diagram_in_control_system_questions.pdfIn PDF document text
    • http://bajaxugezozego.rf.gd/digitech_jamman_stereo_manual_deutsch.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_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 5276 bytes
SHA-256: afaccdb26ceeec957b09f19fdcafd17a654943ce7f088b27cae8794cd9a00e85
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 11112 bytes
SHA-256: 0ab286e32a08d5828e32ce328bfa59174e582dd3263bd5e2101b15238bd578d5
font_02_sfnt_off00012607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12607 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230