Malicious PDF — malware analysis report

Static analysis result for SHA-256 9799ff619156a134…

MALICIOUS

PDF

75.9 KB Created: 2021-02-26 15:20:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6c14a85c7cbd952ff7f0fb0b0fe9c2d8 SHA-1: c9cb4aed55e946c5a9cea7b94e788c9f3e57ca7e SHA-256: 9799ff619156a13401fefb67d36715fc01da2c88d893f02ab9f29669fbb3bb38
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://crophysi.ru/wix?keyword=ff14+wt+calculator PDF link annotation
    • https://cdn.sqhk.co/furaxofir/dject8p/76612769577.pdfIn PDF document text
    • http://andyhong.blog/mevapiv3cs8i.pdfIn PDF document text
    • https://tewukowil.weebly.com/uploads/1/3/2/7/132741555/dagizakaribum_pupip_lexinebofuxo_dulufag.pdfIn PDF document text
    • http://shimano-stradic.ru/41497072671pjqt8.pdfIn PDF document text
    • https://cdn.sqhk.co/jalixuwefes/Ugc9gfO/parker_duofold_big_red_rollerball_pen.pdfIn PDF document text
    • http://trikotoria.ru/54824517257cn6jy.pdfIn PDF document text
    • http://jadusugogawal.iblogger.org/bbc_bitesize_ks3_ict_spreadsheets_revision_1.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/vebefimezibaza.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/wavunot/47541302075.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/97890274116.pdfIn PDF document text
    • http://wekolaxoretewov.epizy.com/40444067697.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/basic_electronics_repair_guide.pdfIn PDF document text
    • http://puloxivomavari.epizy.com/fractions_worksheets_grade_3_with_answers.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_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 4884 bytes
SHA-256: c93bc66dce92d6715da158db5a884a7e68d909923a59eac7567120c0596f2536
font_01_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 10824 bytes
SHA-256: 330f3a0b52bb4b180025e36fe0e02c9a736bde71dc76ade4490a6284569d22f5

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