Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ffdaec6284825c…

MALICIOUS

PDF

64.1 KB Created: 2021-02-18 17:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 525e126372059d40839d18e3649a11d9 SHA-1: 7215ae597f3850c6e5a3576b5071d1b15c927b98 SHA-256: 86ffdaec6284825c42fe0abd3f201e4c54b6cb03d73761624a7edd7186517dae
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a 'horse with no name ukulele tutorial', which is likely a pretext to drive traffic to malicious sites.

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://leonvi.ru/strik?utm_term=horse+with+no+name+ukulele+tutorial PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383445/normal_5fc737cb87f69.pdfIn PDF document text
    • http://idealslimitaly.site/random_chat_with_strangers_without_registrationr767z.pdfIn PDF document text
    • http://lapugupofe.iblogger.org/72555045419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_601b97ef1f819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_60216da24a86b.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/PhfcvKX/tenitujanekezekafati.pdfIn PDF document text
    • http://soldonlittleton.com/do_judgements_go_on_credit_report8afiz.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/gjquejf/azariah_in_the_bible.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459025/normal_5ffdedf2328d0.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/C6jaxih/54642302210.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/dihjalA/flix_movie_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fopupasefe.rf.gd/will_cw_nancy_drew_be_on_netflix.pdfIn PDF document text
    • http://nifibomagogov.rf.gd/tatalaksana_atresia_esofagus.pdfIn PDF document text
    • http://vawimoj.rf.gd/timiwigawo.pdfIn PDF document text
    • http://tuvinuragoma.epizy.com/subject_verb_agreement_worksheets_for_1st_grade.pdfIn PDF document text
    • http://zimeketoxera.epizy.com/xavaximeb.pdfIn PDF document text
    • http://sezeludijufoma.epizy.com/bugonumir.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_off0000bf66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF66 5044 bytes
SHA-256: cd0bb81f6683c01e08f8ed6b25096f1581d70a944867f622833f8af90480a1b0
font_01_sfnt_off0000d06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06C 10248 bytes
SHA-256: 1447ea4459b0dd28bc668c737d95de87599879c8b92c65155428bf728d895e13

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