Malicious PDF — malware analysis report

Static analysis result for SHA-256 91de0f56a1a44faf…

MALICIOUS

PDF

37.4 KB Created: 2020-05-20 15:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: ace2930e0034d3609b9286134cb4cdcb SHA-1: 01d19279cd90d46aa4b60c2f1e462e5208762b16 SHA-256: 91de0f56a1a44faf4ea1e3e33a4be8cabea07bc0ed44975ae472063c25ffad1e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which follow a similar numeric slug pattern. The 'PDF_SEO_LINK_FARM' heuristic indicates this is a deliberate attempt to create a link farm. The ML classifier also flagged this PDF as malicious. The embedded URLs suggest a campaign focused on redirecting users to potentially malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://cozyoasis.com/uploads/1/3/0/7/130776213/130776213.html#monster+industries+server PDF link annotation
    • http://huntsocialenterprise.org/uploads/1/3/0/6/130621059/7646235.pdfIn PDF document text
    • http://danteboutique.com/uploads/1/3/0/5/130539479/fbf64a88.pdfIn PDF document text
    • http://elizabethskipper.com/uploads/1/3/0/6/130621244/lakimesuvalaguxufut.pdfIn PDF document text
    • http://rahthebarber.com/uploads/1/3/0/7/130776034/cadf9.pdfIn PDF document text
    • http://brisbanebabylady.com/uploads/1/3/1/3/131379179/209d26e.pdfIn PDF document text
    • http://gassersphoto.com/uploads/1/3/0/5/130545636/5727512.pdfIn PDF document text
    • http://atemasolutions.com/uploads/1/3/0/4/130435509/9869575.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

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_off000066ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EF 10516 bytes
SHA-256: 9980fe96196998367c80fc713526f21e228d2b1978bbcd0cd91bd869c64e5725

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