Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb43a31f66b38c48…

MALICIOUS

PDF

30.6 KB Created: 2020-04-17 01:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f561c2faceb1cd83546718feb18135e2 SHA-1: f5a472ffab86919d7ad4ad9bcdf48da1a86a1ec4 SHA-256: bb43a31f66b38c4897f78e0c514c25f3469b41105be031f50884dd56d706ce39
94 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO poisoning tactic. The primary URL found is http://impact-active.com/uploads/1/3/0/7/130738596/130738596.html#quizlet+mitosis+worksheet, which appears to be a lure for educational content.

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://impact-active.com/uploads/1/3/0/7/130738596/130738596.html#quizlet+mitosis+worksheet
    • http://meadowlakematters.org/uploads/1/3/0/3/130323406/zawofedarifitetum.pdf
    • http://ledarskapsspel.se/uploads/1/3/1/4/131453051/8996177.pdf
    • http://lordnelsonpac.com/uploads/1/3/0/2/130289292/wigoped.pdf
    • http://diagnozaautotimisoara.com/uploads/1/3/1/3/131398324/raropug.pdf
    • http://juliesfrenchpastries.com/uploads/1/3/1/4/131407592/niraboserivab-purunafimavuzu.pdf
    • http://nikkiwetherellcounseling.com/uploads/1/3/0/4/130483134/8eedaf5d8ad.pdf
    • http://haroldsgym.net/uploads/1/3/0/2/130272355/gawedivota.pdf
    • http://tlsdesigns.shop/uploads/1/3/1/4/131454027/3574722.pdf
    • http://adlibbolton.com/uploads/1/3/0/9/130969019/9783358.pdf
    • http://macdonald-designs.com/uploads/1/3/1/4/131454492/39131080.pdf
    • http://bentbranderupclinics.nl/uploads/1/3/0/8/130814783/sizifa.pdf
    • http://dovetailandrabbet.com/uploads/1/3/0/7/130740255/jokaxotamosozi-gegavisuxedunav.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000518a.bin
6b257e7318bc40a5401ab820340762fdf5b3e96cb261e4ffc8120439b5f5b19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x518A 7464 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.