Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66438f79de99b80…

MALICIOUS

PDF

80.8 KB Created: 2021-03-15 05:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6270d5921e951146bddb9cdc40bdc877 SHA-1: 101e2904508c9355e078655d5973714a4987e1c6 SHA-256: b66438f79de99b804c497b1c1c83f45c4a034ce32f544e7357a7bbcb4ded4792
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9994

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://dafemum.ru/award?keyword=blood+relation+questions+and+answers+pdf+download PDF link annotation
    • http://somubuzesixuwun.getenjoyment.net/angular_momentum_in_quantum_physics_biedenharn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_600c1d25d808e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471081/normal_5ff6869a4b3ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5fd70aac7357d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5fceda57da843.pdfIn PDF document text
    • http://fabujisaw.mygamesonline.org/arpeggios_guitar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_603544d5dc74b.pdfIn PDF document text
    • http://sadugumipid.iblogger.org/oracle_sql_concatenate_long_data_type.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_602f1f51d1a65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465914/normal_600530113d3a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_60490564627b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500444/normal_5fd87a9ec3b24.pdfIn PDF document text
    • http://ditumen.22web.org/how_to_trade_forex_with_100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajivuselome.epizy.com/laboratory_equipment_and_their_functions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98791631-7ad1-4535-a2d8-719bed1b19fb/how_many_american_states_can_you_name_buzzfeed.pdfIn PDF document text
    • http://xefavab.rf.gd/niyoti_bengali_movie_720p.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/centrifugal_compressor_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a32ed12-c513-45fc-9abc-f89474299673/dell_1905fp_driver.pdfIn PDF document text
    • http://kibuwigukakew.epizy.com/dish_network_channel_list_numerical_order.pdfIn PDF document text
    • http://butomepa.rf.gd/business_plan_exemplo.pdfIn PDF document text
    • http://guwoxidewoje.epizy.com/order_of_adjectives_multiple_choice_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9252baa8-37e1-49d8-a2c8-712b06da5924/which_software_for_logo_design.pdfIn PDF document text
    • http://lebikur.rf.gd/l_carnitina_dosis.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_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 5300 bytes
SHA-256: 25755a7e88f0c67d528b4a0f45205e1f3e5c2c603e8d385c7be66d8af3369c77
font_01_sfnt_off00010f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 11224 bytes
SHA-256: 9ae18a44bc0ffa2115f402d67b1379f11a6fbecc7ead2decd84f6dfaf30b22ee

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