Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab8675787b0ba0c…

MALICIOUS

PDF

67.4 KB Created: 2020-12-21 08:43:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 53f132fe3651b99dadc7930690e8d20e SHA-1: 83d95505204a202a912fb7ef49437ab7dcfb64f4 SHA-256: cab8675787b0ba0ca5e81247945c3f368d7bd91dc92b580f51e54fde623f2e8b
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a URL that appears to be a lure for downloading an APK file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/wb?keyword=kuboom%203d%20fps%20shooter%20apk%20download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413977/normal_5fb5b8bc76733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_5fb3f1313a287.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/genedonapubefe/go_psx_emulator_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b74c0f-1cac-4823-ae47-04b6f9e4986d/wobigikisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159ea287-0923-4741-ba61-593944067294/80502861354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6877db-9bad-4504-a403-67f38c67160e/16594547723.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/codex_adeptus_astartes_v8.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc791dd6879d031da12c5b5/t/5fd087d8b8bf0379e60cd53f/1607501784934/16127182774.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b7d288c99b6d37b2fbef/t/5fc54072f8cdb769c68f185b/1606762614416/3922822450.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/connect_for_education_music_appreciation_answer_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dc971c8c741314319700/t/5fc166ccbc819f1cf40d06ab/1606510285310/73568235865.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_off0000c8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C9 5708 bytes
SHA-256: 80fbbf1f78cf9ff5063d925640654ea3f8ac9d675c41c3ab62bc30a37c3ccf36
font_01_sfnt_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 11104 bytes
SHA-256: 8b71f523ef9b960bf7de2c1e6e18cd4b1f33eddb2a09f5d0622d4e8e199f9bee