Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c10fd9313a09ba4…

MALICIOUS

PDF

62.4 KB Created: 2021-02-28 00:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4447c1aa945ab5eed169c67f7dca3e62 SHA-1: 200bc99f2cf10d1ac0a8a57f908f8388a260f16b SHA-256: 4c10fd9313a09ba4e516612712f9d20d2c73a559d74cf57de2fdac476bb8ffcc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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 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://vilenefex.ru/aws?utm_term=how+high+are+hurdles+high+school PDF link annotation
    • https://xukonupuzifig.weebly.com/uploads/1/3/4/6/134621954/57cff3ca1.pdfIn PDF document text
    • http://fasumidivojasuj.iblogger.org/ponozat.pdfIn PDF document text
    • https://wiloropijevor.weebly.com/uploads/1/3/5/2/135299547/gupik_radituxu_dadorore_diwatepalapojum.pdfIn PDF document text
    • http://sejujijowevazuk.iblogger.org/international_law_commission_membership.pdfIn PDF document text
    • https://kovapuneluwaze.weebly.com/uploads/1/3/2/3/132302913/1120248.pdfIn PDF document text
    • http://return-0.com/privacy_and_publicity_beatriz_colominaajsi4.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/does_att_uverse_have_nbc.pdfIn PDF document text
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/895a7cddd71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veziledijiv.rf.gd/app_android_tv_romania.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/canada_states_map.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/primavera_p6_software_free_download_for_mac.pdfIn PDF document text
    • http://gafodix.myartsonline.com/farmer_boy_book_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/16549488344.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/calligraphy_font_generator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/avg_pc_tuneup_paid_version.pdfIn PDF document text
    • http://wisiver.rf.gd/rebus.pdfIn PDF document text
    • http://jusiwanemil.epizy.com/pakomafakusojifidepefirej.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_off0000bab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB8 5252 bytes
SHA-256: 3c2107836ffec7e736ad91b5612cdc150e35c2a607277a56c1cb296c84456e0c
font_01_sfnt_off0000cca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA1 9404 bytes
SHA-256: d95e4b8b1431ce2e1a9ba0b7951428f0075c564c2db4e0fb45adc40ab261d8f7

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