Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1b7ba25c5c87b9…

MALICIOUS

PDF

39.8 KB Created: 2020-11-09 01:50:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cb0cf5c2706d0314623174fd60002f1d SHA-1: e6fd35a4b61b6bc72874f40f0f2d6549c66e6778 SHA-256: 0c1b7ba25c5c87b97c0cd7c45f091343b5ff2ca45cf617d308d855ecc7fa0b70
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains a large number of external links, many of which are part of a link farm designed to boost SEO. It also impersonates Yahoo and presents a fake CAPTCHA to trick users into clicking on malicious links. The primary malicious link identified is https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/lojim_netejuwumobup_rizijalorames.pdf, which is likely a redirector to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/lojim_netejuwumobup_rizijalorames.pdf.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/123?keyword=new+technology+used+in+ww2 PDF link annotation
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/lojim_netejuwumobup_rizijalorames.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f8bc35a3fe19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475992/normal_5fa78932e1506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f9c2613927c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f8864571e4cf.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/xazarujokemus/xelalulovudivitiro.pdfIn PDF document text
    • https://vuvelowol.files.wordpress.com/2020/11/bijufofovotubudabege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f625ffe0-e327-4552-8d43-07bad23b0127/daxeditofibitano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/016e61f4-1287-4468-8d64-f11e535fb9d8/67679299697.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/69255953770.pdfIn PDF document text
    • https://lulililunis.files.wordpress.com/2020/11/kungsleden_trail_guide.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_off00005d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0F 5188 bytes
SHA-256: 47ef9363abb55b846c605c5674045deba5335458039c85932a99893e95618dac
font_01_sfnt_off00006edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDB 10520 bytes
SHA-256: e4b7f32575d4bf35d27e487345d740e4c49e14cc3ef7de8c676016968bd17ebf

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