Malicious PDF — malware analysis report

Static analysis result for SHA-256 5681215b7fc351de…

MALICIOUS

PDF

84.2 KB Created: 2020-12-22 02:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 07f26b147d2f09d6b28f1e0fe51dc938 SHA-1: dc13bce58e208ee4120f93a6df95a1b8b16cafec SHA-256: 5681215b7fc351de512d90fcc93250ded7444e6937ba3beb8591e5016f272ab8
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://traffset.ru/aws?utm_term=semi+formal+clothes+for+interview PDF link annotation
    • https://setivegubuwo.weebly.com/uploads/1/3/4/4/134446573/dofubesupuri-zojosoraj-sejunoton.pdfIn PDF document text
    • https://jenitexul.weebly.com/uploads/1/3/4/8/134859983/7022628.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/9554650.pdfIn PDF document text
    • https://safusugefivelu.weebly.com/uploads/1/3/4/3/134346528/57fa03642ad60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c862ea4b-d2d5-4c72-893a-29b134ada43a/mukelotapazoripu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1fff233-ce0f-48a6-81a2-7c32eea737ba/nimudugasulate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d78312b-9ebc-452a-8781-5353fda9fff7/goxabaxuju.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf49d12dd96f5918e4bf7c/1606371794011/parker_county_appraisal_district.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76e582c-a984-495a-a2d2-d8e12013a024/geometry_unit_1_test_review_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d906baed-4cf1-4ac8-a790-92d5d6fb4717/1066_the_year_of_the_conquest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7dd723-8234-4f6d-afed-1ba355b32386/pci_mnl_117_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a898db-c385-44f8-8d07-01cc5520f425/papa_johns_original_crust.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_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 5376 bytes
SHA-256: 49db44cbe8e8ef41ce02f9ccbde81f6881b4d3f3a46170a838c19620d0d3508c
font_01_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 10820 bytes
SHA-256: da2634c05bdd847e3e1aa6eb7a5cd4f2e471e1167d9ec8899a8dbb35a6a11a5b

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