Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbc5e6fe25ec8f8…

MALICIOUS

PDF

77.4 KB Created: 2021-04-20 10:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2bd55d215b22417d502901438c6a0f88 SHA-1: a4526e201d806a305645510703c6dbf08a329e1b SHA-256: 4fbc5e6fe25ec8f86bb3bdd9a4d6c1a707cd812266a49cd399608b8db801990b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://crophysi.ru/strik?utm_term=what+qualifications+do+you+need+to+be+a+navy+seal PDF link annotation
    • http://sks-expertiza.ru/d__d_place_restaurantewuhk.pdfIn PDF document text
    • http://harmony-market.ru/the_green_mile_trailer_deutsch2f9id.pdfIn PDF document text
    • http://gibelepij.scienceontheweb.net/managerial_accounting_mcqs_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450428/normal_6001d71ee7d93.pdfIn PDF document text
    • http://allroadkamchatka.ru/navy_seal_training_program_redditpvg2m.pdfIn PDF document text
    • http://nadukod.22web.org/7._snf_sosyal_bilgiler_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_605026c8f0236.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493245/normal_5fcaf7eb95913.pdfIn PDF document text
    • http://mbfsopg.com/jajasudokevegutekifagitelo7j74.pdfIn PDF document text
    • http://sokfresh.fun/exercicios_de_torque_e_alavancagxs7a.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/uml_activity_diagram_symbols.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/exerccios_associao_de_capacitores.pdfIn PDF document text
    • http://ruboperuba.iblogger.org/qbq_the_question_behind_the_question_sparknotes.pdfIn PDF document text
    • http://tesapewuj.22web.org/creative_writing_assignments_for_middle_school.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_7b9d41b36a7e41c28da986a344811c2e.pdf?index=trueIn PDF document text
    • http://gulisolira.rf.gd/genetically_modified_crops_examples.pdfIn PDF document text
    • http://xemigososefof.atwebpages.com/zofefinigokidazedazu.pdfIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_52c4a0ea440749be8fc563c2d7327705.pdf?index=trueIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/norinetek.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/bojuna.pdfIn PDF document text
    • http://vekemelegewimo.atwebpages.com/global_ecological_footprint.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_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 5452 bytes
SHA-256: 2688ed16c1a6c50d3c6be5cfdd88711ae4cb57e6353066f38e7f0bc8d24e58a2
font_01_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 11216 bytes
SHA-256: 827bdc72b1a4f177fcf8849798aa0868ba031c184d0295eb15731bb127b628aa

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