Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24de42c7ce0f41a…

MALICIOUS

PDF

79.6 KB Created: 2021-03-14 16:29:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9a5fc7578fb4f1bdc16b22b99820bd5d SHA-1: 203bc9ec6b70bca627a25f93a68ade306586dfff SHA-256: c24de42c7ce0f41afde0813b85cd18ade90f2809eb2b442cfca9a0f30b8fb178
186 Risk Score

Malware Insights

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

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 0.9990

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://soxebez.ru/award?keyword=bocce+ball+rules+pdf PDF link annotation
    • https://cdn.sqhk.co/sojebudegoba/hOijSif/76488436567.pdfIn PDF document text
    • https://cdn.sqhk.co/kewebogi/jznAo1O/27426170364.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/gjkvehg/wuvinazotor.pdfIn PDF document text
    • https://cdn.sqhk.co/xagegegozi/esKji7Y/to_do_list_examples_excel_in_one_cell.pdfIn PDF document text
    • https://bogibopedazite.weebly.com/uploads/1/3/4/0/134018154/1107122.pdfIn PDF document text
    • https://cdn.sqhk.co/kenujowemi/jdXhiRY/negonugizasafudopubon.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/6cab55e4.pdfIn PDF document text
    • http://rivuxini.66ghz.com/aspiration_pneumonia_guideline.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/8044877.pdfIn PDF document text
    • https://xadigepuve.weebly.com/uploads/1/3/1/4/131454317/tavufodaduka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_60215ca9cc4ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449788/normal_5fe71937aa81d.pdfIn PDF document text
    • https://wotipufa.weebly.com/uploads/1/3/1/0/131069738/werugepikafobaxiware.pdfIn PDF document text
    • http://misefosoteb.iblogger.org/presbyterian_liturgical_calendar_2018-201.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_6e7d4c4ee82744068f57ffdd97239513.pdf?index=trueIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_4f94a39466054104ba72526a26363867.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_ab5414c4bcf0472db4891ba56a362d47.pdf?index=trueIn PDF document text
    • http://zawagebojirowe.rf.gd/brainstorm_green_needle_video.pdfIn PDF document text
    • http://vubebolideb.rf.gd/81344044084.pdfIn PDF document text
    • http://wubazofebaludo.epizy.com/pelojazape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d84db2d-57ca-4f99-a967-7ab450074321/44448593393.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_c6d238fd60bb4e4e8c77a0bd1a454fa3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5cf896b-bb85-4556-a429-ffc4a01bed05/sevefapoxajisivogixulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7da69ac-328a-4238-ba6a-54e4c2c74aad/what_is_noun_adjective_and_adverb.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_f76d830bc0a14de798c10a242a78db50.pdf?index=trueIn 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_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 5336 bytes
SHA-256: eb12ef8bb629b8c388149b45d2d67b0688a97e22d63b399fc9065c0fe82ad41a
font_01_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 10564 bytes
SHA-256: 44b91a8f2a8d99df777d3949387efd2a032f1ad6f5d98f88a8bbbe20e472ffac