Malicious PDF — malware analysis report

Static analysis result for SHA-256 2319aa8198ca34aa…

MALICIOUS

PDF

67.5 KB Created: 2021-03-07 23:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 53c5a20b5b70eea073f17624ea9363b7 SHA-1: d81c3065e001c18d7fc91b54211357eeb6b4211b SHA-256: 2319aa8198ca34aa506ab87ff46a3a6cf1b17dea59c54d3ebde4bd2598135f24
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 0.9998

Heuristics 5

  • 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 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/wix?keyword=ar+verb+practice+worksheet+pdf PDF link annotation
    • http://orbitan.fun/niv_study_bible_zondervanp3n19.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/54165099357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5fe9cdcba4317.pdfIn PDF document text
    • http://komarovskii.xyz/4761994859707mnd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5ff95cffe2492.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/a_little_book_on_the_christian_life_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486201/normal_5fedf988976a0.pdfIn PDF document text
    • http://jumpfs.space/mcgraw_hill_reading_wonders_5th_grade4tfi6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449629/normal_5feaff18ecf62.pdfIn PDF document text
    • http://svoydvalend.xyz/do_oil_heaters_work3avs4.pdfIn PDF document text
    • http://1yamal.space/910664534675h000.pdfIn PDF document text
    • http://hookup673.site/hotel_new_yorker_new_york_teslas8rfw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemesuxaw.myartsonline.com/air_o_swiss_7144_demineralization_cartridge.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/92627414470.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_58f5bde9e3c44446a4c92a9502f285a8.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_aba701550644493e9b29862b32990d29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xesigeze/builder_template_bootstrap.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_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 5556 bytes
SHA-256: 09dc9f78ad9c7c5907efba3d36bfcec338c070344c436a7d04c352300f8c469d
font_01_sfnt_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 10184 bytes
SHA-256: 8f4012e8c2799e32e65e9f8457a55b66d83a73351cdbca9cb1cefc83f5cac357