Malicious PDF — malware analysis report

Static analysis result for SHA-256 745c2943864dfc5c…

MALICIOUS

PDF

75.9 KB Created: 2021-03-29 18:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1e5033e8170aa406772a0d1428ffd45e SHA-1: 4185a4f0e9ea290bb8f1b2f261d47734ef8272d3 SHA-256: 745c2943864dfc5c4cdb108109f80d5fc771cb62df5ce2d7ef01698a082b914e
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 0.9997

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://druttle.ru/wix?keyword=simple+machines+lab+middle+school PDF link annotation
    • http://koponegigat.medianewsonline.com/38792154224.pdfIn PDF document text
    • http://zuvalasit.mypressonline.com/81721309674.pdfIn PDF document text
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/abe674c15fe846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377662/normal_5fdd6d0dae919.pdfIn PDF document text
    • https://juvezunadu.weebly.com/uploads/1/3/5/3/135306862/b9f5a8e1b7baec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428038/normal_6030a50b191fe.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/en_que_consiste_la_educacion_superior_en_mexico.pdfIn PDF document text
    • https://guzajemifuraruv.weebly.com/uploads/1/3/0/8/130874286/nijawilamekoguk.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/23807661177.pdfIn PDF document text
    • http://palopej.sportsontheweb.net/sekopudo.pdfIn PDF document text
    • http://wawesoja.sportsontheweb.net/weight_lifting_workout_log.pdfIn PDF document text
    • https://lonomunemol.weebly.com/uploads/1/3/6/0/136082408/b24a4b49d79a66.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/how_to_reset_a_dometic_rv_refrigerator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_600a766deb0f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4f2351-756b-43af-9949-acd69323adca/nijuvobuzesokewumavafani.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/technical_drawing_with_engineering_graphics_15th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9696684-ea2c-4333-813f-4b86a29c4676/punabufogesifirak.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/karusozifozozulijokejaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519465b6-9ae7-4f00-a71f-be89e1232d36/what_is_the_difference_between_city_mini_gt_and_city_mini_gt2.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/who_is_the_youngest_god_in_greek_mythology.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_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 5460 bytes
SHA-256: 8b6c58c595a715cef6dae90092657288a77f0b9eb3a2f6c2d9d1d061966774ce
font_01_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 10540 bytes
SHA-256: 03357ba4e61cc6ff753835f2bcfcfe62a9ebcbc95fde2cf433787f6d49adbc05

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