Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8624daf33074f6…

MALICIOUS

PDF

36.0 KB Created: 2020-04-10 10:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b9348d1d2d95976ca34c3c2d533bf51e SHA-1: f1949a4a6edfe591152db9dae29a36ea6794cc6b SHA-256: 0d8624daf33074f6ebee9d6f980d84f00df6f6effdf6bb69a535d8005aa56b6a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be dynamically generated or part of a link farm, indicating a potential SEO spam or content distribution scheme. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs suggest a pattern of directing users to potentially harmful or deceptive content. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://kylaconner.com/uploads/1/3/1/4/131454106/131454106.html#cuanto+es+un+litro+en+metros+cubicos
    • http://rightbyyoursidehomecare.com/uploads/1/3/0/6/130622011/811717.pdf
    • http://jmalawntech.com/uploads/1/3/0/5/130551427/tarejesuta-sezunudawekarep.pdf
    • http://mappingandplanning.com/uploads/1/3/0/9/130969422/nibeturomudu.pdf
    • http://myassetprotectionlawyers.com/uploads/1/3/0/5/130551668/b6485652252c.pdf
    • http://athenspalittleleague.org/uploads/1/3/1/3/131381166/3fa38d3accee0.pdf
    • http://gacsalyi.net/uploads/1/3/1/1/131163623/bubegagedizep-luner-nesegoveniju.pdf
    • http://pranayogawellness.org/uploads/1/3/0/4/130483981/6067921.pdf
    • http://francoandformulafun.com/uploads/1/3/0/6/130621367/kimotoxumu.pdf
    • http://touchingimpressions.com/uploads/1/3/0/7/130775918/takumal-loradutumuwad-pilorijafoj.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_off0000623f.bin
825364d772bba079fde84a49b07d9f29ac1c340f3c00e41d6c89773f37382697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623F 8472 bytes

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