Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59efcb7c7e40eee…

MALICIOUS

PDF

83.9 KB Created: 2020-11-29 04:15:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0cc5c69a0a5782cc6bf845aa62cd436c SHA-1: 255c45f114fc3e90d06a17c6061fb714d1855813 SHA-256: b59efcb7c7e40eee940920134046b360f238a0fefe1fa2ce3fd86da797c0ca0f
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://trafftec.ru/123?utm_term=ship+of+the+dead+read+online+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5f9b404008dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_5fa5b592d1efc.pdfIn PDF document text
    • https://guburumo.weebly.com/uploads/1/3/4/3/134322172/dajipevexobe_zubokuler.pdfIn PDF document text
    • https://roxunasof.weebly.com/uploads/1/3/4/3/134312726/01ab5a50c.pdfIn PDF document text
    • https://dovogejeromew.weebly.com/uploads/1/3/4/6/134666082/6070c265892df6b.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/welanisowari/cytological_fixatives.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/rar_unzip_free_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e23f8d-d949-48ba-bd16-167fb611472c/eat_what_you_watch_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828d664e-09db-4528-b59b-bc85afb7e709/1994_chevy_silverado_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/sizagamosusodimolopodaseb.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/sosijo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 4840 bytes
SHA-256: a1ed4fa1e9aa253974ec422f113a4a36e4075d29c6ca5d1c2ca00ac42128ca1c
font_01_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 10772 bytes
SHA-256: a9dd22b8fd43bebada3ca3d9e360aaeb33bf1901a26bbdf197e76473f188591c
font_02_sfnt_off0001346c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346C 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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