Malicious PDF — malware analysis report

Static analysis result for SHA-256 12341281e184ee24…

MALICIOUS

PDF

37.2 KB Created: 2020-03-27 06:38:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 413a8357b219c11fd1963c3a039b6805 SHA-1: 0a5dd079a0b73eb22b19473750101e03efda2669 SHA-256: 12341281e184ee24cb724ffe1a0a104553ca754f0db9bd26b23e46a26b63fed2
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'http://melliesinvestments.com/uploads/1/3/0/5/130589252/130589252.html#palabras+con+por+lo+tanto', and numerous others point to PDF files hosted on various domains. This suggests a tactic to manipulate search engine results or distribute potentially malicious content through these linked PDFs.

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://melliesinvestments.com/uploads/1/3/0/5/130589252/130589252.html#palabras+con+por+lo+tanto
    • http://hostmaster.wir-sind-oa.de/uploads/1/3/0/6/130604305/9208103.pdf
    • http://thecongrams.com/uploads/1/3/0/8/130873922/fikurazugut.pdf
    • http://dreamixer.com/uploads/1/3/0/5/130588568/8171956.pdf
    • http://californiawells.com/uploads/1/3/0/5/130539597/zulavufapijoven-surezefadusase-pejibuzuvaf-dapolur.pdf
    • http://ctsf.us/uploads/1/3/0/2/130272613/3199359.pdf
    • http://kingramseysbitters.com/uploads/1/3/0/5/130538981/5333812.pdf
    • http://djsacademy.com/uploads/1/3/0/8/130874366/vugolo-kipupedof-semonawo.pdf
    • http://stiftelsenbakombilden.se/uploads/1/3/0/6/130604150/giragodabu.pdf
    • http://gardeninglore.com/uploads/1/3/1/1/131163723/5720579.pdf
    • http://root.ceotech.vn/uploads/1/3/0/4/130476359/6290688.pdf
    • http://cpanel.dokimellc.com/uploads/1/3/0/2/130288333/4307441.pdf
    • http://simplybiblestories.net/uploads/1/3/0/5/130543168/2536786.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_off000065b3.bin
765d1b29c7f093fb97f6b028235bd6ddc9dcc003c75a89fb99492db19ffbe668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 9060 bytes

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