Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cb6ea1e6970fd5…

MALICIOUS

PDF

84.0 KB Created: 2021-06-11 00:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c968933e662b60a694082008d8f08f84 SHA-1: cd567c371a1f136a12ac8c2b2b55ceb1d5cbd404 SHA-256: 56cb6ea1e6970fd5712c89afd421756f7891fc5475fcec41691f739249f119db
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/pbw?utm_term=pokemon+liquid+crystal+walkthrough PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406820/normal_605b1abb955c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_60221b58e2615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_6033d9bc94b59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_6061f1f68b7a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_60434bb6ecb2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_605855864462a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_6058acd896834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fd2dedc510f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_60137c2394e03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_5fe8bd4ee6a01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407997/normal_5ff971cca007d.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/f902e76f-bbb9-4108-b379-6fd4887613dc/zogenewigepesibisasofuf.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/f/69188928823.pdfIn PDF document text
    • http://sukagafamo.pbworks.com/w/file/fetch/144729729/gulopa.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144416241/fanala.pdfIn PDF document text
    • http://bopidix.pbworks.com/f/tiktok_unicorn_apk.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/xolosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c877bf2a-0fb9-4cb3-b131-76da2a62ba82/rejoxaledegobesagawefab.pdfIn PDF document text
    • http://gabumur.pbworks.com/f/minecraft_apk_download_for_laptop_windows_7_free.pdfIn PDF document text
    • http://movovepavuzi.pbworks.com/w/file/fetch/144896709/monerukiraveluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb620a2-75e4-43c6-a83b-68ea5a990be0/two_step_equations_with_distributive_property_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e921289-54d8-4cac-b939-8009fb604818/cefr_level_a1_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67adea78-9c43-44ae-aa64-78bfc3b8c9cf/bb_passport_bisa_whatsapp.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_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 5736 bytes
SHA-256: f04fef959a96343cb35f831fb9c7548589a27ba0ee182cf4a5b26fbd778238a3
font_01_sfnt_off0001193d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 11948 bytes
SHA-256: 54b4b59ca770ddb539f9ef14ed0759bd643510f8a9c22cf79b872aa7b32e9ced