Malicious PDF — malware analysis report

Static analysis result for SHA-256 a873a1d75c1ea149…

MALICIOUS

PDF

36.7 KB Created: 2020-04-24 00:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f473626117af8fb0323873d0543e1e1f SHA-1: 90a47361d89947a2511385838a8d0a61bf8f6361 SHA-256: a873a1d75c1ea149ba8ee4ef9f9d96e73086565180479dbce84b4ca076d8d6ad
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, a common tactic for SEO poisoning or directing users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to a 'Compound noun worksheet' and embedded URLs, suggesting a lure to drive traffic to these external resources.

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://trikli.com/uploads/1/3/1/3/131384470/131384470.html#compound+noun+worksheet
    • http://azbiblequiz.com/uploads/1/3/1/3/131379696/9545079.pdf
    • http://mrskramlsclass.com/uploads/1/3/0/8/130874180/misogumo.pdf
    • http://whitehouseohiolibrary.org/uploads/1/3/0/5/130551182/e76fd17.pdf
    • http://thewrappinghouse.com/uploads/1/3/0/5/130551876/3c963.pdf
    • http://teacherkitty.com/uploads/1/3/0/8/130874529/gevibizobo-divegozederevad.pdf
    • http://claudiagarciaosorio.cl/uploads/1/3/0/8/130814328/d6bf821d7003d10.pdf
    • http://digitaltechnologieswa.com/uploads/1/3/1/4/131483153/wasivadosadapebekaja.pdf
    • http://sheepontheright.com/uploads/1/3/0/5/130589223/nunirujirowij.pdf
    • http://generationxx.org/uploads/1/3/0/6/130603895/wedidalopekuwuj-domefiziraju.pdf
    • http://testmockpractice.com/uploads/1/3/0/3/130313111/jenakavedojokizuw.pdf
    • http://wilsonbeautystore.com/uploads/1/3/1/4/131406515/f27e6bd12b4af57.pdf
    • http://austinmetalroofers.com/uploads/1/3/0/5/130545557/7057364.pdf
    • http://thedoghousearizona.com/uploads/1/3/0/6/130621228/ad6a14029.pdf
    • http://athomeanniversary.com/uploads/1/3/1/1/131164079/rarolixamur_deludojurox_biwipexo.pdf
    • http://athomeanniversary.com/uploads/1/3/1/1/13116
    • 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_off00006988.bin
3fe09d34be88053f18af9b92a4b6bbc5ff09d8c90edc145dc4fd0a6d07850a5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6988 7536 bytes

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