Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbc1342d04ac7ec…

MALICIOUS

PDF

74.2 KB Created: 2020-12-18 04:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1c54c1cd4d526c8b096d0587c5e3bc3c SHA-1: 02ee1348f124dc2bdbe94a3ab83cce3957467312 SHA-256: 6cbc1342d04ac7ec61a922d9c50e8b22f0ed277315b9ddacf6402e3d42fc5d22
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, with one pointing to a suspicious domain. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially harmful content, possibly for SEO abuse or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/strik?utm_term=lee+hyo+jin+ho+dong PDF link annotation
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/40af2.pdfIn PDF document text
    • https://sonuboguf.weebly.com/uploads/1/3/4/3/134310015/24e183ca07c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370054/normal_5fc744c85fc6d.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/letasivogezale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408863/normal_5fdbd205d7dac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428078/normal_5f9fbb4cb4c90.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/gewisetug/45976475891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0bd0a2-cccb-4017-b676-6894966086d1/kukimuposotalikupojebope.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/wifenelizurafuva.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/55500743181.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/canacol_energy_ltd_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/641073ad-24bd-4d03-af1c-792f17578796/21473661561.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/tedopejazexifarunewelin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3808cd2c-3374-45ac-a751-76ccdea49441/damuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45790c4c-bfee-4786-8944-67990a83204b/apple_pencil_grip_hack.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_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 4176 bytes
SHA-256: 904b951b9c2e9392e4c7c1ca8c9a29542363637a279ed122d546e50b1886ff88
font_01_sfnt_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 4688 bytes
SHA-256: 769b8440147c4fd03c8e86a5a61e74bfebffbb04acdcd6ec7cd2087165f58475
font_02_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 10732 bytes
SHA-256: ed00abcb189de1ce1bf395cb29027798ee4d89625b5afdb46589d7dcfb083bfe

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