Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63e1c2b74241a92…

MALICIOUS

PDF

132.0 KB Created: 2021-04-19 11:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6abb650db37559ff0b9b9902532425ce SHA-1: b8476eeb3f54bd6f90f8cc80a676d7aadeed94b2 SHA-256: d63e1c2b74241a92a99516fc53e6e3b0fcc97ad05f76e7c893d1e0d143fab799
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URL, 'https://baarspo.ru/strik?utm_term=livro+paulo+freire+pedagogia+do+oprimido+em+pdf', is likely the primary lure, disguised by the document title 'Livro paulo freire pedagogia do oprimido em pdf'. The PDF structure and embedded content suggest it's designed to trick users into clicking the malicious link, potentially leading to phishing or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=livro+paulo+freire+pedagogia+do+oprimido+em+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386824/normal_5fdff9ab04917.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479678/normal_5fcc4697e59c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_606cbe002cd2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476301/normal_5fd65652823e6.pdfIn PDF document text
    • https://cdn.sqhk.co/fatepotax/ho6Hgcc/86967408384.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/O9wjfts/my_sprint_app_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/Fjj2xha/904432740.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/Qhhhd5w/phoenix_arcade_game_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455914/normal_5ff660e61f94a.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/Cjfgejc/80523433264.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_451b3263facf4a33b6bf77bd93ddc95b.pdf?index=trueIn PDF document text
    • http://genuziga.epizy.com/accidentally_in_love_korean_drama.pdfIn PDF document text
    • https://b81f28a7-a6cc-4df9-aebb-a76b708ee4b5.filesusr.com/ugd/df05b2_53785ebcae0647e89f9a5dcf318a002e.pdf?index=trueIn PDF document text
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_2234b5e78c6f4af7b56068d4c6125c43.pdf?index=trueIn PDF document text
    • http://kitomov.epizy.com/72942318041.pdfIn PDF document text
    • http://lolugedupagimu.epizy.com/definition_de_la_sanctification.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/bewaxiw.pdfIn PDF document text
    • http://gabamad.epizy.com/donomidu.pdfIn PDF document text
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_bd624d36976f408c8c96cd5232a69de5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/collections_book_grade_7_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/game_implosion_full_version_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/gofalewerogetibo.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/70672052824.pdfIn PDF document text
    • http://jewezoku.epizy.com/56736713977.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_off0001adc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADC5 5184 bytes
SHA-256: b1914491cfa0f558e3f96fb040e18c22724b15279d882939bdc5d7b25016b685
font_01_sfnt_off0001bf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF65 14344 bytes
SHA-256: 22120c6766f5b6a017fc4b0f8a96cf4a89612a1a94f398f368ddd62dbc2e473e
font_02_sfnt_off0001ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA69 16232 bytes
SHA-256: 719c88cc197a7ec486d17b4426835efdd9d76ca1bce2371290cd62ce127f8dec