Malicious PDF — malware analysis report

Static analysis result for SHA-256 862c3a368818695d…

MALICIOUS

PDF

77.2 KB Created: 2021-06-02 06:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b248cb3b2a5dd94d840ca1cf75faaa4f SHA-1: 81e3d560db93ff728734943f48e7494cc6d3dc7d SHA-256: 862c3a368818695dd2364b2896bfbba5b1a9d9775a663c415fd5918565747eb1
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded links, many of which are part of a link farm designed to redirect users to potentially malicious sites. The document's content and heuristics indicate a lure for remote support tools, specifically mentioning TeamViewer, and impersonating cloud document services. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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
  • 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://archism.ru/pbw?utm_term=teamviewer+12+free+download+for+android PDF link annotation
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/2886805.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/dbd4887ff.pdfIn PDF document text
    • https://xudubuwar.weebly.com/uploads/1/3/4/0/134041851/e8b576c53ae523.pdfIn PDF document text
    • https://nuzibekupin.weebly.com/uploads/1/3/4/3/134338080/6450094.pdfIn PDF document text
    • https://gipuwibozomaz.weebly.com/uploads/1/3/4/8/134891778/bisitiza.pdfIn PDF document text
    • https://bodupojuribun.weebly.com/uploads/1/3/4/7/134758420/zedasinuduxekot.pdfIn PDF document text
    • https://wijaxogelawatu.weebly.com/uploads/1/3/4/6/134622036/xilejaz.pdfIn PDF document text
    • https://famofupogatom.weebly.com/uploads/1/3/0/7/130739443/wuxiwememaboxexoked.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
    • http://bujolajoxek.pbworks.com/w/file/fetch/144489357/fast_and_furious_7_telugu_full_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1812176a-5114-425f-8d1e-f71aa27e0eee/how_much_do_journeyman_electricians_make_in_florida.pdfIn PDF document text
    • http://wiliser.pbworks.com/f/abbyy_finereader_14_crack_only.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/f/digonadigesajuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16109cfb-85e4-492e-a7eb-a57fab7993ec/how_to_set_up_a_cobra_29_ltd_chrome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85270379-093f-45a5-8c3f-6d6ed5e58b0f/samsung_series_6_50_inch_4k_ultra_hd_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1f5920-eb2d-4c97-bad2-50079d8d47fe/what_does_violating_a_norms_mean.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/japadulowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dcbb664-83ec-4745-8bc5-645fb9e7045d/briggs_and_stratton_generator_carburetor_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3934dbbd-a6f7-464e-9b1c-92bf33fafc48/19460415545.pdfIn PDF document text
    • http://ronefete.pbworks.com/f/ark_survival_evolved_solo_engram_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f48e10bb-7dd9-4df8-9c55-40365d1be2f9/57850948190.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/f/gawutawanorodeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa97ef9-6753-4abc-a1bc-b9771fdc95be/wendler_531_boring_but_big_results.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_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 4868 bytes
SHA-256: c2bb3ffebf2e1d0abbae28d750c8d72c39fc34fdf30c67d400c3e10b70ec44d3
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 9868 bytes
SHA-256: 1c5675d3fb5c9323e7ed4d6889a11d05b5518f30973dda2b5ac74c421ed6237c
font_02_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3