Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8703840d195bc4…

MALICIOUS

PDF

39.4 KB Created: 2020-04-05 11:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dbf1721380cbf44f456ea4e9dcb8ea1e SHA-1: 043f6b07a2eb6ae27aa0ed5e8cd34f53292453c1 SHA-256: 4c8703840d195bc4b1f0a7283a36e2d98564c4eaae53fc7e0736c9d4a6950f6d
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, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. The ML_NYX_PDF_MALICIOUS classifier also strongly indicated maliciousness. No scripts were extracted from this sample, and the document body text is heavily obfuscated, but the sheer volume of external links is the primary indicator of malicious intent.

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://virtualbas.net/uploads/1/3/1/0/131070309/131070309.html#verbos+en+presente+perfecto+ingles+y+espa%C3%B1ol
    • http://rueonauburn.com/uploads/1/3/0/8/130873794/d05be3db5b1.pdf
    • http://remingtonhistoricalfoundation.com/uploads/1/3/0/4/130488544/7934395.pdf
    • http://ilumes-imagine.com/uploads/1/3/0/6/130640175/xoxodetuboju_jukavutem_fiwefo_valefasevol.pdf
    • http://seekinghealthsimply.com/uploads/1/3/0/5/130541208/5343526.pdf
    • http://tribelicious.com/uploads/1/3/0/5/130588621/3927537.pdf
    • http://dekaoliveoil.com/uploads/1/3/0/7/130775572/3546963.pdf
    • http://lessonsforlittlelearners.com/uploads/1/3/1/3/131383614/zuzudobaso.pdf
    • http://hitormissgunrange.ca/uploads/1/3/0/3/130313120/mexufebuxux.pdf
    • http://exquisitefiestas.com/uploads/1/3/0/7/130775923/vapalupofomaj.pdf
    • http://ngemi.net/uploads/1/3/1/4/131438389/3477574.pdf
    • http://corporatecarols.com/uploads/1/3/0/8/130813143/weteti.pdf
    • http://allthingschildren.org/uploads/1/3/0/4/130476523/6dd3395bc586a29.pdf
    • http://benbencongelados.org/uploads/1/3/0/8/130814788/5456298.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_off00006cee.bin
46baac7baae88455b128df983e3be3b2535c0a64f0726b901be041c18aa619d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEE 9196 bytes

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