Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a58055609bbcf2e…

MALICIOUS

PDF

37.3 KB Created: 2020-05-21 05:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: cd2039333c71bbc57252973a0c70088d SHA-1: fd2ce9ce9a85b133576a5333b8020d8f72a8e7f9 SHA-256: 7a58055609bbcf2e943b2f9065ea8ef431fa79e834f6a50871cfbbeca791232a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a multitude of external PDF files, likely to distribute malware or engage in phishing. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://elitehumanforce.com/uploads/1/3/0/8/130874424/130874424.html#big+hero+6+rule+34 PDF link annotation
    • http://my-medicare-insurance.com/uploads/1/3/0/5/130589268/pusowineses.pdfIn PDF document text
    • http://normasregistry2019.shop/uploads/1/3/0/5/130539935/3b8d5ee7f678.pdfIn PDF document text
    • http://enablingenvironments.net/uploads/1/3/0/5/130539414/2131011.pdfIn PDF document text
    • http://frosthoneybeefarm.com/uploads/1/3/0/2/130273584/nijed.pdfIn PDF document text
    • http://medsatoz.com/uploads/1/3/0/8/130813357/xivajoxudupisobowo.pdfIn PDF document text
    • http://coxinspections.net/uploads/1/3/0/5/130551226/watinujixor.pdfIn PDF document text
    • http://propertyinvestmentworld.org/uploads/1/3/1/1/131164476/2322655.pdfIn PDF document text
    • http://carolinafinngard.es/uploads/1/3/1/4/131454850/lepotonozoluxo.pdfIn PDF document text
    • http://bethrayl.com/uploads/1/3/0/7/130776526/7264e969812f207.pdfIn PDF document text
    • http://a21stcenturychurch.com/uploads/1/3/1/4/131452893/mulibakikako.pdfIn PDF document text
    • http://4thoughtpsychology.com/uploads/1/3/0/7/130776149/boxegotowozo_wumanupanimara.pdfIn PDF document text
    • http://samaiyahsart.com/uploads/1/3/1/1/131163914/2481443.pdfIn PDF document text
    • http://3ddynamics.org/uploads/1/3/0/8/130813779/virarifafewi_lumubob_napev.pdfIn PDF document text
    • http://indizien.info/uploads/1/3/0/6/130620407/posuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6831 9908 bytes
SHA-256: fda2009c090e9a3b6f14c93a6f84d792c17de12a913e90793d11f9a68d353670