Malicious PDF — malware analysis report

Static analysis result for SHA-256 b775dd3cfbf7b6a2…

MALICIOUS

PDF

80.0 KB Created: 2021-05-23 22:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5db970ff96afa90b2edae606b9d0a6a5 SHA-1: aa187146414601b67e891ff3469dc8de4702cac4 SHA-256: b775dd3cfbf7b6a24c87279b5e7d09ba224a7aa5e882120aaaac69b25fe7fdbe
234 Risk Score

Malware Insights

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

The PDF document uses a cloud document lure to trick users into clicking embedded links. One of the primary links, 'https://yafferge.ru/strik?utm_term=google+drive+unlimited+storage+mod+apk', is identified as a malicious redirector. The document also contains a large number of external PDF links, suggesting a link farm for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://yafferge.ru/strik?utm_term=google+drive+unlimited+storage+mod+apk
    • https://xasedomag.weebly.com/uploads/1/3/1/0/131071243/5a1d3307a.pdf
    • https://static.s123-cdn-static.com/uploads/4403263/normal_5ffdfcddb793c.pdf
    • https://rixemeja.weebly.com/uploads/1/3/4/7/134711448/bafaruburesut.pdf
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5fd1d3aadf38a.pdf
    • https://static.s123-cdn-static.com/uploads/4369646/normal_5fe0d77c175a7.pdf
    • https://static.s123-cdn-static.com/uploads/4471690/normal_5ff158d9cfd99.pdf
    • https://cdn-cms.f-static.net/uploads/4490273/normal_6069e7523b8f0.pdf
    • https://cdn-cms.f-static.net/uploads/4422135/normal_601758344c454.pdf
    • https://cdn-cms.f-static.net/uploads/4405946/normal_6015f14fbed93.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a8375dfe-b6ec-499e-9cd1-2ae5e5cf3222/why_does_he_do_that_by_lundy_bancroft.pdf
    • https://s3.amazonaws.com/zifozujiwi/gre_test_prep_books_2020.pdf
    • https://s3.amazonaws.com/latufenaw/arteria_carotida_comun.pdf
    • https://uploads.strikinglycdn.com/files/c5cf0694-c3df-464d-b72f-9eaeb26469f4/60452213164.pdf
    • https://s3.amazonaws.com/pilazi/autodesk_vault_workgroup_2018.pdf
    • https://s3.amazonaws.com/jusagi/xenetulorewowusoku.pdf
    • https://s3.amazonaws.com/kegubinefuda/bififapemitukebo.pdf
    • https://s3.amazonaws.com/gotitibekovi/tepubikip.pdf
    • https://uploads.strikinglycdn.com/files/665acce5-4e0e-4fa3-8e31-29f5833cc6a3/citizen_eco_drive_skyhawk_manual.pdf
    • https://s3.amazonaws.com/norozovijalu/camera_apps_free_jio_phone.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f97b.bin
367823faac00d99b152436e70c7b38e0bd5182a8d2ea644f6829f2637957d398		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 5436 bytes
font_01_sfnt_off00010bea.bin
862ae22a6087cd804c1a4a982bd2daee6d72fd04bb4d68df1c40163c0bf45482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEA 10784 bytes

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