Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24bc422a7a07575…

MALICIOUS

PDF

82.0 KB Created: 2021-03-12 05:56:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f1311cb85717feef61b713322573f273 SHA-1: 995f78b91421dae9524b1c5c994620a95f6cb428 SHA-256: a24bc422a7a07575101109ee4e1bd97e1853bb93dd30737b48fa394717142f05
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/award?keyword=automotive+technology+books+free+pdf PDF link annotation
    • https://cdn.sqhk.co/zezinojox/HAniaje/75192616861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_601bcf89660c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5ff5baf0e3940.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/Q9vx1ib/dora_and_friends_what_happened_to_boots.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/WHb4if4/tegiramikilavon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_5fd8cd183b852.pdfIn PDF document text
    • https://cdn.sqhk.co/sofedelabo/ygcaXMC/decision_matrix_template_microsoft_excel.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://s3.amazonaws.com/ziwuvijevo/6th_grade_reading_comprehension_worksheets_online.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_41add711143243229df7929cefc8eab6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memexelu/28976508713.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_6bba9b296bdd41d2aa920ea318e5fd9b.pdf?index=trueIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_38b75407b2bc459aa1ddedf6570fc1cf.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_5b462856bf8c46c18639ec754feb35bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavale/pewitukeserizizezuzevaf.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/21546726913.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/maxi_dresses_formal_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/ada_diabetes_screening_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/bufepapunusujolimigemofu.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/taiwan_drama_eng_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/antenatal_care_depkes.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/eurydice_sarah_ruhl_full_play.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_0ed05ce11ba6415b89a8438bee700d89.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 5596 bytes
SHA-256: 17e8d51b72c43705bbca811d26b799faf78301d72a82a85266f4fa27367fbb84
font_01_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 10380 bytes
SHA-256: 0773f7df0cdae87417eac22daff27d9cb90598ae21d2f4cff5fb32d954ea9238
font_02_sfnt_off00012c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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