Malicious PDF — malware analysis report

Static analysis result for SHA-256 4489203626126f58…

MALICIOUS

PDF

35.5 KB Created: 2020-05-26 22:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19287c204d23103df19892afc07b9aab SHA-1: f8ee3a435266448aac79a8cf61e2cec04a6edf24 SHA-256: 4489203626126f58bafb0c18fa13c173edeaf74d980a83a07e2a165b1ab66dbf
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs point to various domains, suggesting a link farm or distribution network. No scripts were extracted, and the document body is largely unreadable due to encoding issues, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://cpanel.lifestylelanguageschool.com/uploads/1/3/1/3/131383330/131383330.html#atravessa+cidades+e+campos+mas+jamai
    • http://recoletter.com/uploads/1/3/0/5/130551132/52d6984.pdf
    • http://bellacapelliweddings.com/uploads/1/3/0/3/130313491/nikixejaw_makufezurewu_fefuganu_sejako.pdf
    • http://thorrinden.org/uploads/1/3/0/5/130545957/7091708.pdf
    • http://elliotfisher.com/uploads/1/3/1/4/131454808/c0221d375ca38.pdf
    • http://wagenselleryoga.com/uploads/1/3/1/3/131380720/c4a881952c2358.pdf
    • http://titletattle.com/uploads/1/3/0/4/130483520/lomugokuteginubezazi.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_off00005db5.bin
f1702d253c668aee18174e962b7409ea44400342eadf2f5036047cd7329b53f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB5 11400 bytes

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