Malicious PDF — malware analysis report

Static analysis result for SHA-256 82978715aa7bef75…

MALICIOUS

PDF

39.6 KB Created: 2020-04-11 06:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: f08733f9be1c7d1faaaf99d89307e9c6 SHA-1: 0cecd71e7a87e404a8302801adbbfcd5089d3cc4 SHA-256: 82978715aa7bef75537dcf259ec50361508bcf3154d585c739f7b28b2aa3a75f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files with numeric slugs, indicating a link farm for SEO spam. The ML classifier strongly flagged this PDF as malicious. The embedded URL `http://host.creativedatainc.com/uploads/1/3/0/8/130813077/130813077.html#electricity+and+magnetism+purcell+so` is likely part of this malicious infrastructure.

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://host.creativedatainc.com/uploads/1/3/0/8/130813077/130813077.html#electricity+and+magnetism+purcell+so PDF link annotation
    • http://vincoach.com/uploads/1/3/0/5/130590719/tozikikepewaduluku.pdfIn PDF document text
    • http://nanomat2019.com/uploads/1/3/0/5/130588920/67bd8.pdfIn PDF document text
    • http://latoniachristianchurch.org/uploads/1/3/1/1/131164152/a386e2e6ea2f.pdfIn PDF document text
    • http://doggiedeluxe.com/uploads/1/3/0/7/130776737/gaweperozefag.pdfIn PDF document text
    • http://eastlondontowing.co.uk/uploads/1/3/0/8/130873712/1679327.pdfIn PDF document text
    • http://buzzpages.ca/uploads/1/3/0/6/130604550/4698629.pdfIn PDF document text
    • http://waibluegrasschapter.org/uploads/1/3/0/4/130476060/9129931.pdfIn PDF document text
    • http://sshvug.com/uploads/1/3/0/7/130739664/8174241.pdfIn PDF document text
    • http://somethingpurple.org/uploads/1/3/1/4/131407278/kowuwenubu_lisev_supewobawapadu.pdfIn PDF document text
    • http://sjwtears.com/uploads/1/3/0/5/130588433/dajaduzutowuzis.pdfIn PDF document text
    • http://drkuoeyecare.net/uploads/1/3/0/2/130288386/5294061.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73D7 7896 bytes
SHA-256: 06feeeaf54a1cfcb6392e40ef77b77eb9c2373622f83e7e52de3f0ed24f391dc

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