Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b239df2e2e6b83a…

MALICIOUS

PDF

96.5 KB Created: 2021-04-02 01:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1dbfb9413f39ffefa8cb6677afd4cb5a SHA-1: 168ca74eadd14c8bee87a09fbb5c3855e85f97e3 SHA-256: 7b239df2e2e6b83afb694b5237d45d78a1ce67ab7c6c50a2fd630d8f48e777d0
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://pelibifir.ru/award?keyword=basics+of+fortran+programming+language+pdf PDF link annotation
    • http://vedivux.mygamesonline.org/percy_jackson_and_the_battle_of_the_labyrinth_chapter_2_summary.pdfIn PDF document text
    • http://kanurapubefuxo.iblogger.org/watch_war_of_the_worlds_2020_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_6039e6622bdb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_6061967fb3499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5fdc08ea12772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_606636bb2211f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383800/normal_603ee5a64e6d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_603085a2c467f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530712/normal_604fab976dd9c.pdfIn PDF document text
    • http://nafigunagofadab.getenjoyment.net/gegapugawiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_6022280230eec.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/bogijexu/sixolusanaditumojif.pdfIn PDF document text
    • http://linanimeb.rf.gd/the_one_minute_manager_meets_the_monkey_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/acquisitions_incorporated.pdfIn PDF document text
    • https://3c31dc6e-14a3-4e60-a373-897e90814001.filesusr.com/ugd/9e17d8_3215689ab62a4ca4b32dcbc2bce9c21e.pdf?index=trueIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_665c5fe382d7416b9f5080e2908552f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/wegumo.pdfIn PDF document text
    • http://xipitidugizen.rf.gd/android_version_10_names.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/59404040760.pdfIn PDF document text
    • http://tinozireru.epizy.com/captain_kirk_uniform_color.pdfIn PDF document text
    • http://jiporeve.epizy.com/89561843855.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/camh_foundation_annual_report.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_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 4016 bytes
SHA-256: 403effb9c3c639814c148cac1e498e74bf8eb2f2dc2f9263a666fdeaf4abcb47
font_01_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 5524 bytes
SHA-256: d4193d58d50cf5a9a5bf7bc69fc349ecff7717692f8fb442a6454c18d7902e06
font_02_sfnt_off00013683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13683 11612 bytes
SHA-256: 082af95d65a03815f7210452934cef328944c616f2096001222a0156693a51cb
font_03_sfnt_off00015e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E8C 16164 bytes
SHA-256: d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44