Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8615966013e005b…

MALICIOUS

PDF

73.4 KB Created: 2021-03-08 13:26:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 86fdb43e32f8549cf28feaccbbd7932c SHA-1: 985d29af6e7acda05aecc0b451ccd95594665ca1 SHA-256: b8615966013e005b5808dbe6b948bbed9a5e4002c3cd376a07285db8ae4bdf63
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 0.9997

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 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://nipisod.ru/wix?keyword=cavaquinho+em+ingles PDF link annotation
    • http://xezosejosofof.iblogger.org/77332720533.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5ff6872ec1e91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_60216a3fddb05.pdfIn PDF document text
    • http://tivepijezar.22web.org/how_long_is_the_curse_of_strahd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fe5d6d88f3eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_5fdb5b6bcb6bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/dunadotudavinuwefiv.pdfIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_3d54db0064214dffbae9a3228620bc59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lukepepe/dilagetefu.pdfIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_25f6ccdfe7d5427f82baecaf67dbc134.pdf?index=trueIn PDF document text
    • http://watenumedar.rf.gd/apa_science_lab_report_format.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/what_is_the_role_of_chlorophyll_a_and_b_in_photosynthesis.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/assyrian_cuneiform_alphabet.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/3005606299.pdfIn PDF document text
    • http://vujipopeb.rf.gd/best_washer_and_dryer_reviews_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/fitted_sheets_only_twin.pdfIn PDF document text
    • http://nolepukopele.epizy.com/mastering_biology_chapter_13_reading_guide_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/adobe_indesign_templates_envato.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_5e11a5aac54545d7a3436e2270780ca1.pdf?index=trueIn PDF document text
    • http://bumazuk.rf.gd/magic_call_application.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/pearl_harbor_facts.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_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 5092 bytes
SHA-256: fcefbd005a5278bcc69725e634966c692f313f5ad87a5c637130d1cf3a3a7a33
font_01_sfnt_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 10480 bytes
SHA-256: 0065f53ccab1a4f09823e803b8861cd5aa49fb678459d4201b1c92b381881d0c

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