Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66bec41e3e0496d…

MALICIOUS

PDF

47.6 KB Created: 2020-11-06 01:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b2135bcfe49361ca0b027c6f74531371 SHA-1: d7200da40eca964abd13ce40f3822f9907599da6 SHA-256: c66bec41e3e0496db9f634f3abeabf86b33214475560be93a97ba923aa540a78
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 1.0000

Heuristics 4

  • 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://traffking.ru/strik?keyword=intro+to+physical+science+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5f9af4b2e1a26.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/3e352.pdfIn PDF document text
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/gutidozogutomosumi.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/fowikorejodi/30584127021.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/astrophysics_neil_degrasse_tyson.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/kukozarupi.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/kowijanip.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/49632176376.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/dejewabeka.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/choosing_the_right_word_unit_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64cf35d5-6240-4e9a-9798-b263012209ce/fizudemokuwaxide.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/cardiac_arrhythmias_ecg.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/cobol_interview_questions_experienced.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/72707593413.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_off00007a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A83 5216 bytes
SHA-256: c6f38fd3ccf1242ebd2d71bdc27427578de1c865177376be0350d49e3a1707c4
font_01_sfnt_off00008c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C52 11084 bytes
SHA-256: 04bdcb451e04bb01c841a031230a6d9deea92aa6147e121e93a1f1985d04b620