Malicious PDF — malware analysis report

Static analysis result for SHA-256 37eab00a495ef865…

MALICIOUS

PDF

79.5 KB Created: 2021-03-30 18:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 025c51eebafc4d9f055a08d517095267 SHA-1: eab99c8dccac853a8359fea916533e231f6afac4 SHA-256: 37eab00a495ef8651fb78254f4a3130d624d684d4132f4df6a2960555d5b4127
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 0.9996

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://gimoguvi.ru/wix?keyword=convert+standard+form+to+vertex+form+by+completing+the+square+worksheet PDF link annotation
    • http://bubajeme.22web.org/cylindrical_roller_thrust_bearing_catalogue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_605d9cfa21284.pdfIn PDF document text
    • http://igcopyrightclient.com/48988969744rc2ii.pdfIn PDF document text
    • http://cetapp.xyz/eclipsemp3.com_fit_clip_manualbgnre.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454184/normal_602416aa348f4.pdfIn PDF document text
    • http://am-sound.ru/29653297252kbp0v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5fe79d020412d.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_602205947e0ae.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://uploads.strikinglycdn.com/files/c3ddca29-d57b-435c-8180-4b9d03df2e31/sulobutu.pdfIn PDF document text
    • http://gifagedopodub.epizy.com/tokigifeserexoxos.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/coursera_machine_learning_week_8_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/zadafuvukirenuti.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/migare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efeec789-af73-4509-ba16-7facdde80f26/what_are_the_symptoms_of_a_bad_ignition_lock_cylinder.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/gy6_150cc_performance_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272452d4-b036-4fef-91fd-03f4226fc8d8/40738121596.pdfIn PDF document text
    • http://piperopire.rf.gd/lidobumik.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/79354446104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfa6711-cae1-4568-8dfa-0a53a71fdfe3/sefebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f9627e-8acc-4771-9347-10f069d88f44/maths_formulas_for_class_10_in_hindi_bihar_board.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_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 6124 bytes
SHA-256: db8410b7712f79b7a27e9ea83d13b0aa00fe30f1715095f8adb6a762c5e23b5b
font_01_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 11376 bytes
SHA-256: 2567b0e5f3b9c04a04ad816d969a9afa67cb81cfa65a80eda41c92bc62a67246
font_02_sfnt_off00012103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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