Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a00d7dce98c28e…

MALICIOUS

PDF

67.3 KB Created: 2020-04-05 12:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: acd842c24ab64ea5159e8626af23ecd5 SHA-1: 5a1a615d0f3e85f2a28284e5cb3593c601b02a4e SHA-256: 86a00d7dce98c28ea2e1d3f2192fa77e36922bf73117684a212ea426e30720fb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links to other PDF files hosted across numerous domains, as indicated by the PDF_SEO_LINK_FARM heuristic. This suggests a link farm or content distribution scheme. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text is largely unreadable binary data, but the presence of the URL http://marcelgiger.com/uploads/1/3/0/8/130814584/130814584.html#manual+de+supervision+tif within the document body further supports the link-based attack pattern.

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://marcelgiger.com/uploads/1/3/0/8/130814584/130814584.html#manual+de+supervision+tif PDF link annotation
    • http://vjohnsonperceptionsllc.com/uploads/1/3/0/4/130435898/2444937.pdfIn PDF document text
    • http://mercedesmax.com/uploads/1/3/0/6/130639183/nowijonamatuton-ruteza-jufimipidopumu.pdfIn PDF document text
    • http://matthewgardlik.net/uploads/1/3/0/2/130270904/3406477.pdfIn PDF document text
    • http://anidea.company/uploads/1/3/0/4/130483207/tanemarofesiwi_nusujogoma.pdfIn PDF document text
    • http://503corp.com/uploads/1/3/1/4/131454269/sepurigufig.pdfIn PDF document text
    • http://championcivil.com/uploads/1/3/1/4/131438003/lelaju_tuzuzapazo.pdfIn PDF document text
    • http://theibisheadreview.com/uploads/1/3/0/2/130288549/xoninozawasotu.pdfIn PDF document text
    • http://mediadunes.com/uploads/1/3/0/6/130603971/viwazugemefot_tenukikezeka.pdfIn PDF document text
    • http://callumsstag.com/uploads/1/3/0/5/130550760/gonopewesibiwag.pdfIn PDF document text
    • http://themompreneurmarket.com/uploads/1/3/0/5/130551621/6264899.pdfIn PDF document text
    • http://sarahsavers.com/uploads/1/3/0/4/130478203/0b14f7490cba885.pdfIn PDF document text
    • http://alliancemortgageco.com/uploads/1/3/0/6/130620951/kegipifurilazixi.pdfIn PDF document text
    • http://kcrme.com/uploads/1/3/0/5/130551041/pafomokozesarij.pdfIn PDF document text
    • http://funniestpuppies.com/uploads/1/3/0/8/130813378/9898159.pdfIn PDF document text
    • http://sarahdguerra.com/uploads/1/3/1/4/131438461/giredonidumajevow.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_off0000dea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 8740 bytes
SHA-256: 132512806addf00fed53b7713e9d50c6849f34ffb3549db6e0542079695d3740