Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb774c37995abfb…

MALICIOUS

PDF

74.7 KB Created: 2021-02-22 15:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bbd4face1fa43d348ed22d1bac8e5d39 SHA-1: a65bac65896e821532e2cbb0b320ab1d07844de0 SHA-256: 4fb774c37995abfb91e020ec764597f53ddbccf5b290b5cbd276298f3f49c753
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains or link farms, suggesting a malicious intent to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to a popular movie title, likely to entice clicks on the embedded URLs. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=diary+of+a+wimpy+kid+movie+full+movie+youtube PDF link annotation
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/6697994.pdfIn PDF document text
    • http://tortomsk.ru/mixefejowemikmq3vs.pdfIn PDF document text
    • https://gilabekavug.weebly.com/uploads/1/3/4/5/134597011/nugexorefajisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_602816ddb296a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_60281fdf2408c.pdfIn PDF document text
    • http://alerma.ru/wwe_championship_fighting_gamestwfee.pdfIn PDF document text
    • https://jovanifapekiba.weebly.com/uploads/1/3/0/7/130739678/5067dac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_6021e84181987.pdfIn PDF document text
    • https://nozodipipagim.weebly.com/uploads/1/3/1/4/131438171/ponerufiwatogufe.pdfIn PDF document text
    • http://hookup681.site/why_is_my_ge_fridge_not_making_icepq7nj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sazariwapa/autograph_movie_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/45878511940.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/vaccines_calling_the_shots_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/simple_website_templates_html_code.pdfIn PDF document text
    • http://zukizibukuxupir.epizy.com/xoguzevinuxamonobumugubu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 5244 bytes
SHA-256: fc5061310f110465fb7ec2b3b77d22b2dff29fe2be33cae0280855f4aa2a0999
font_01_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 10232 bytes
SHA-256: 915f4d91b50d88959854bb4bfc194733bbad1775619260c13cb304b2f42b4d02
font_02_sfnt_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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