Malicious PDF — malware analysis report

Static analysis result for SHA-256 f771e4987e1e3ed8…

MALICIOUS

PDF

30.7 KB Created: 2020-03-20 11:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 0111bb0495775aea61d9138c1a4d19a0 SHA-1: ddd10cfa1123c4558bc058d66bae97ebc37bc63e SHA-256: f771e4987e1e3ed86f38ab92a33bf750905b29135fd43fba8644da6beba31d45
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body and extracted URLs suggest a link farm designed to direct users to numerous other PDF files hosted across various domains. This pattern is often used for SEO manipulation or to distribute further malicious content, though no specific payload execution was directly observed in this sample.

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 http://trailsandpavement.com/uploads/1/3/0/7/130775589/130775589.html#the+jam+jar+whitley+bay PDF link annotation
    • http://stjohncic.org/uploads/1/3/0/4/130479312/6295519458a24a.pdfIn PDF document text
    • http://www.cwworkshops.com/uploads/1/3/0/6/130604980/9276967.pdfIn PDF document text
    • http://luciasuite.com/uploads/1/3/0/5/130545043/bojomimujigum.pdfIn PDF document text
    • http://ybfa.co.uk/uploads/1/3/0/9/130969946/1313063.pdfIn PDF document text
    • http://mnbaby590988.org/uploads/1/3/0/8/130814711/bf44ef1685a58.pdfIn PDF document text
    • http://thebloodyrook.net/uploads/1/3/0/2/130270956/lekomovukakepe.pdfIn PDF document text
    • http://67-37-101-213.splcwa.org/uploads/1/3/0/5/130551611/memaxer.pdfIn PDF document text
    • http://euphoricencounters.org/uploads/1/3/0/5/130539797/negoxis.pdfIn PDF document text
    • http://millikenconsults.com/uploads/1/3/0/8/130814531/doxonedisaripitar.pdfIn PDF document text
    • http://kimswansonwellness.com/uploads/1/3/0/2/130272587/339211ab562ce.pdfIn PDF document text
    • http://www.magicdragonfacepainting.com/uploads/1/3/0/8/130813528/9234403.pdfIn PDF document text
    • http://www.pampiersonartist.com/uploads/1/3/0/7/130775211/pikuvopekuv.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5251 7168 bytes
SHA-256: 68711ba2d7091f8a62de0221fd70c608617a8359a5a27bc8f98ecc1119aa71af