Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4c69936397b95d…

MALICIOUS

PDF

87.0 KB Created: 2021-03-28 09:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5f548694e5ca96a4eba4774c21a5fb70 SHA-1: 714b3c6f33b06a7b47f3352f04d705a213f32e55 SHA-256: 4a4c69936397b95dea73ac605ada72ee2be69fe89558b76391312a9504f09715
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 0.9992

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://dugedepap.ru/123?utm_term=cuneiform+stress+fracture+management PDF link annotation
    • http://melowew.scienceontheweb.net/livebitimagetexinomojusek.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/pedebutoma.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/63d5d9809d2aa6.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/ihjxKkz/camera_apps_2018_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_604ee35a0d14d.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/y621hcd/78645003191.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/ieiagfP/mountaineering_club_seattle_new_years_eve.pdfIn PDF document text
    • http://vifubavawet.mygamesonline.org/maciej_matasek_english_advanced_vocabulary_and_structure_practice.pdfIn PDF document text
    • http://lumogodasekepi.mypressonline.com/oracle_sql_developer_download_for_pc.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/what_to_wear_to_formal_afternoon_wedding.pdfIn PDF document text
    • https://cdn.sqhk.co/vezubusevof/ihorihd/duviwovajazuru.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/mulalugukobiranirurugagem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_601615e35fe37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_60218543ec001.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/sofezinexalagu.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/9436123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474750/normal_60200ab365e02.pdfIn PDF document text
    • https://zivotawab.weebly.com/uploads/1/3/4/5/134576919/3297252.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://92fbd7ca-8480-4723-bb2c-19523f9dca15.filesusr.com/ugd/29946e_4fd4a5583db74d6fb36c702882432cf9.pdf?index=trueIn PDF document text
    • http://pikubub.onlinewebshop.net/citizen_navihawk_watch_instructions.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_646f04b29d044f8d9355066b8671b2b9.pdf?index=trueIn PDF document text
    • http://tiwatimab.atwebpages.com/how_to_choose_a_reiki_practitioner.pdfIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_30662ab2cc0045abbec17a23fffdbcd4.pdf?index=trueIn 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_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 5076 bytes
SHA-256: 19a4400cab13aa940952d85a20cc3afd06a65086ef67a80dc639af70d14a0a29
font_01_sfnt_off0001293e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293E 10816 bytes
SHA-256: 5a3f07ec635df31128b97a95faa214858f24e1bedf9e566714f4832a833c3cde

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