Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5aee1ff76a13ca…

MALICIOUS

PDF

78.0 KB Created: 2021-03-28 19:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a3d77ad6e237019b47b4adcafe98acfe SHA-1: 1314a0239832dcb0d2816e9bdcdd47c9e7420ce4 SHA-256: 5e5aee1ff76a13ca076482aa17d64fd2cc6bc9affedd146841b49e666e12c8ed
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 0.9991

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://vilenefex.ru/award?keyword=antonyms+and+synonyms+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393359/normal_5fe7c4b54b594.pdfIn PDF document text
    • http://popisazono.getenjoyment.net/envision_math_grade_5_teacher_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_60158adab2bb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457312/normal_5fcf99019f7ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_5fe70931c5cd6.pdfIn PDF document text
    • http://fonudesuwobulud.mygamesonline.org/developmental_biology_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_6035c2d1d6497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495526/normal_6025537fae28b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445118/normal_5ff845d1cfea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495050/normal_60198f369813e.pdfIn PDF document text
    • http://tasigezagu.scienceontheweb.net/carcharhinus_longimanus.pdfIn PDF document text
    • http://tediwaxivuj.sportsontheweb.net/46207863878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_600e467946f17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefokirof.onlinewebshop.net/duzilarizimebafewusuvimi.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/33182483475.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/stanley_jump_starter_1200_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34842678-2371-46fe-8ee7-8b80fd139968/blank_place_value_chart_with_decimals.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/espn_fantasy_football_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/kusugezerefebuseg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f117b3-95eb-4403-8d9b-cf63abcacc38/what_is_the_role_of_media_politics_and_religion_to_terrorism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39dbf80f-ffac-4196-8b43-772be7c429a9/they_say_i_say_4th_edition_with_readings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f924627-d1d5-4aca-b9ab-05381dd6b0ee/cheapest_data_science_degree_online.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/tasejaxogizesokabib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41c3779-1188-4ee9-8d69-91602f330151/27354890701.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_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 5496 bytes
SHA-256: 9b4c0d5df058f10a6a4b568730da00088c6c9656658ff90a06575b046d280496
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 11200 bytes
SHA-256: ee5340b288c4ca5c8ac239bb70f4dfa4e2bc9d8d887b2a1df1d40d129e64d9b1

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