Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e60fd79ab82bd7f…

MALICIOUS

PDF

83.3 KB Created: 2021-06-06 11:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c715b6d5366e233657d64d39ce3c20d8 SHA-1: 594bc0d6f30046c940352e5b07d2e8f24e06d74f SHA-256: 3e60fd79ab82bd7fbbd550cae9db05664870d13ab371b9f4447c77dbc9b25e54
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be related to 'Cisco anyconnect vpn', potentially a lure for users seeking VPN software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://leonvi.ru/123?utm_term=cisco+anyconnect+vpn++windows+8.+1 PDF link annotation
    • https://bokozadag.weebly.com/uploads/1/3/0/9/130969835/medoboz-sonujatumomemi.pdfIn PDF document text
    • https://pibubeje.weebly.com/uploads/1/3/4/3/134374065/gegejuxuj-wefanomemag-mibesewevumoma-wedogigadis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407988/normal_603e97f81ccc4.pdfIn PDF document text
    • https://tutonaxubetu.weebly.com/uploads/1/3/5/2/135296536/koxekotodupog.pdfIn PDF document text
    • https://sugowula.weebly.com/uploads/1/3/4/6/134646485/rofufakorilivibun.pdfIn PDF document text
    • https://tumotasefon.weebly.com/uploads/1/3/5/3/135317172/wabupilaf-vojuvolerobi.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/gizowipobowigaled.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470979/normal_5fe4cba17c378.pdfIn PDF document text
    • https://xobabitunebad.weebly.com/uploads/1/3/4/5/134598054/wufunozu-bagisi-darelubizugeru-mawelurubime.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/d10d9cc9-349c-4474-b2d3-fc02be7a943e/74770963892.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/tomudejotav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad6f0e6c-cb7a-46cc-8700-a9c6e442a7ad/what_is_the_british_policy_of_indirect_rule.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/f/gobuxasir.pdfIn PDF document text
    • http://zixereves.pbworks.com/f/90064776774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e6b1d07-0f17-435d-a701-b43998b97c7a/85114969651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08fa6004-bcbd-4fc2-80f0-8bdbd740154e/how_to_set_up_a_zoom_meeting.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/93050269472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c2bea05-f0c7-4817-baac-4d108681aac9/is_2_months_enough_for_cfa_level_1.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/evan_moor_corp_daily_reading_comprehension_grade_5.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_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 5376 bytes
SHA-256: 46438308a080aede04490f4b58ce263b912f0c61039df8c44c41fa11fe74d24c
font_01_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 11832 bytes
SHA-256: dfb0ced6e19eebfabf14a7fcdbf75672a0a896e3738940402c35d6d17e4d0a56

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