Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6805a7234298fc…

MALICIOUS

PDF

35.5 KB Created: 2020-05-13 05:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cdab9a07c491b2a5ab386a661f991eed SHA-1: d78359c913d9c41814e7a07f367315fdb6cc2e8a SHA-256: 5a6805a7234298fc632c29ed581aea3e122d08ea7bc71879e9cab4fdb09206f4
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body also contains a URL that appears to be a lure for setting Java versions in Android Studio. The presence of numerous links suggests an attempt to manipulate search engine results or distribute malicious content, aligning with a phishing or SEO spam attack pattern. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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://estudio-thuban.com/uploads/1/3/0/8/130814788/130814788.html#set+java+version+in+android+studio
    • http://theupsidefrown.com/uploads/1/3/0/6/130621709/terirodaz.pdf
    • http://mariannl.com/uploads/1/3/0/6/130639747/631ec8f43ed.pdf
    • http://michaelfinnigan.net/uploads/1/3/0/5/130542908/boxogiwifibalebuv.pdf
    • http://techdependence.info/uploads/1/3/1/6/131606733/57a2ace81e.pdf
    • http://redeemernewton.com/uploads/1/3/0/6/130639869/zagasitado-zefolarefiwid-zokabulerug.pdf
    • http://selenagalvan.online/uploads/1/3/0/2/130287929/tuxoru.pdf
    • http://melread.com/uploads/1/3/1/6/131606284/4099195.pdf
    • http://ufo-moving.com/uploads/1/3/0/2/130289436/movaxoj.pdf
    • http://erniesalloys.net/uploads/1/3/1/6/131607662/papitesarefu-vajorotet.pdf
    • http://printmasterprints.com/uploads/1/3/1/3/131379447/jorinitumebiza.pdf
    • http://youngmindsmatteradelaide.com/uploads/1/3/0/4/130488220/kazaf-ruzasesu.pdf
    • http://intentspartyrentals.ca/uploads/1/3/0/9/130969179/6b08dd8c8af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eb9.bin
7ccbe2c963d237b4c349b3e1e211d4dbae9f87283c25c2ee2d8a0011464d1840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB9 10508 bytes

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