Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3af6addc57bee22…

MALICIOUS

PDF

79.6 KB Created: 2021-06-14 15:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1322a893863d69eb1d775e0aa92d9581 SHA-1: 135679521a2d03b70b1e1140f5d3006be87de906 SHA-256: c3af6addc57bee229e4a0932488814b90581ea43eed4c239429821971ecdd94a
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically an SEO redirector for free downloads. The embedded URL, https://medvor.ru/pbw?utm_term=coin+master+mod+apk+latest+version+may+2020, is directly associated with this phishing attempt. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://medvor.ru/pbw?utm_term=coin+master+mod+apk+latest+version+may+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495846/normal_60c242731b8ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_60bd1c89bc4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_601887d23dc98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427086/normal_5fe55910bda2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476432/normal_6003493913b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_6023db615bf8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446651/normal_5ff46c291d15e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_60c389ac2a54f.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/fafe6757-f5f3-43e8-8d54-3376c66ef732/fitova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b217c27d-5dcf-4ff7-84b5-63ba0827373f/how_to_replace_dustbuster_14.4_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5aac856-d832-4d50-a8d3-c04b0b45141b/cost_to_repair_loose_crown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a137db7f-2f61-475a-b280-2fab706fd46d/95196719592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff3cb67-ff08-4359-b6cf-befcaf7677b9/fuzukef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ebba5d-f8e4-477b-abff-c516266be418/are_dehumidifiers_expensive_to_run_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab772aea-8726-4bd3-8939-99e9b341ccbf/linksys_ac1200_router_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/411e3d62-7112-4298-bfe3-2be888d203b5/nuclear_decay_chemistry_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5124cc47-6fcb-4aa6-938d-c1f4794cc8cd/zuwedamep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d56b274f-5f5c-4310-8578-c78c1e9dd15d/tebotegixalirefeluribo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e8880d-0864-4d00-87d0-abdb199e5628/24596866262.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 5508 bytes
SHA-256: e739ebfbe3baa751cc6423873190a85cd318be4164de6d7e9b2585b4ece899a5
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 11416 bytes
SHA-256: b2b099a42bc31dbf8ab9f7c7db2e6954c32002095611cbf3faa52a0228bb43b1
font_02_sfnt_off00011b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B79 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67