Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ba81580cb1fc94…

MALICIOUS

PDF

124.4 KB Created: 2021-03-15 05:29:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7b995bfc6595572e9c5ad028abc83e63 SHA-1: d8bf6c08b75acaed731c0b3dcc0ccef48a7d377e SHA-256: a5ba81580cb1fc94b79113c6a0906f7ea92323e4877049533016c6d24a05b2ec
156 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 0.9997

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 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.
  • 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://nipisod.ru/wix?keyword=53.+russia+in+revolution+crossword+answers PDF link annotation
    • http://springital.fun/jump_over_the_moon_meaningw9d3i.pdfIn PDF document text
    • http://yblda.fun/96101690916edqtp.pdfIn PDF document text
    • http://goldenframecollision.com/sample_letter_of_recommendation_for_assistant_professor_positionn44qz.pdfIn PDF document text
    • http://bloomwithdeanna.com/sabaw85icz.pdfIn PDF document text
    • http://seomagnat1.online/gugunodipapeniizyl8.pdfIn PDF document text
    • http://creditscoreusa.info/the_spiritual_man_sermon7jk22.pdfIn PDF document text
    • http://dazinifuxevoji.22web.org/nys_franchise_tax_report.pdfIn PDF document text
    • http://psylath.com/jilodojurid5l1m0.pdfIn PDF document text
    • http://kreativoblako.com/14015132812ek4dl.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/mexijegedakol/hollywood_movies_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/febrile_neutropenia_asco_guidelines.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_9a5358fee82447a08c872ff003404acb.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_c134b8327c6240309e4646219755f268.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/computer_system_validation_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/15358945646.pdfIn PDF document text
    • http://midugome.rf.gd/xigamosabikupapika.pdfIn PDF document text
    • http://falabagilotopor.rf.gd/diary_of_a_wimpy_kid_book_14_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/44619359075.pdfIn PDF document text
    • http://pevurevakube.rf.gd/xakemoronudetor.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/94668935726.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 43508 bytes
SHA-256: 07a7b26bb9693daf0d0466e948a78c29bdd5e0e9b8aeb68c733df34a4e15c27c
font_01_sfnt_off00018e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E30 5312 bytes
SHA-256: 7d580811639c0cdda51bd4a863150db4ccc15d5aaae830ce2b14ca5fb2157d3b
font_02_sfnt_off0001a066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A066 15068 bytes
SHA-256: 1153ffb1c23f222b06d7c3a54d987e53676c00e54ce40d9f8894398c0f071254
font_03_sfnt_off0001cd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD7F 16332 bytes
SHA-256: 8cccff1e3b2106167e1b49795b43f5724ad7adbe3698728996d2427f9c6a33e5

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