Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f2c3972fbf03d8…

MALICIOUS

PDF

37.2 KB Created: 2020-04-13 07:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5baf6fbf9fdd56e98cc8ca619aee743e SHA-1: ba4ab945ab7379df26674dc98b812e8188eab35c SHA-256: 09f2c3972fbf03d89809850fbf7c553f6e18ed1fec39ac559e9a898f5470e4b0
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains a URL that matches one of the extracted links. The primary function appears to be directing users to a vast collection of other PDF files hosted across numerous domains, potentially for SEO spam or to distribute further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://atasteofjamaicaandmore.com/uploads/1/3/1/0/131070158/131070158.html#ecuacion+vectorial+de+la+recta+ejemplos+resueltos
    • http://baraspektrum.com/uploads/1/3/1/6/131636737/e96497251a6f.pdf
    • http://stagelife918.com/uploads/1/3/0/8/130814401/5970209.pdf
    • http://cocoscoot.fr/uploads/1/3/1/3/131381679/3476747.pdf
    • http://cecilwinzer.com/uploads/1/3/1/3/131380120/kenaxejutugir_kapoxekewufutik_kebuk.pdf
    • http://garysautorepairservice.com/uploads/1/3/0/9/130969942/mowamisi.pdf
    • http://artforahome.com/uploads/1/3/1/4/131453465/gutezunufedane.pdf
    • http://paisleypropertysolutionsllc.com/uploads/1/3/0/9/130969332/6420307.pdf
    • http://mysticalinkz.com/uploads/1/3/0/5/130545278/1573300.pdf
    • http://niche3dlamps.com/uploads/1/3/1/3/131379904/telawonegisuwepara.pdf
    • http://cedarparklawnservice.com/uploads/1/3/1/1/131164319/759762.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_off00006791.bin
ce045bdf9a2ff4c217dd1952725f998d48af081ba7785879d9486c0d92f96102		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6791 8712 bytes

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