Malicious PDF — malware analysis report

Static analysis result for SHA-256 817257394dc73249…

MALICIOUS

PDF

44.7 KB Created: 2020-06-17 07:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 250dc746bffb2380a5cb41125e9a64ce SHA-1: f6f029fbf2151734e927ecb579e6fef809a7cec6 SHA-256: 817257394dc73249584c87af7443b86d5548dfd97f8f1bde7f1ca0e73de186d5
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with a link farm or SEO spamming operation, potentially used to host malicious content or redirect users to phishing sites. No scripts were extracted, limiting the analysis of direct payload execution.

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://sixty29.pleasingfood.com/uploads/1/3/0/8/130874277/130874277.html#html+tags+with+examples+pdf
    • http://cpanel.castleislandcamps.com/uploads/1/3/0/5/130550774/1780694.pdf
    • http://carpenterhomesllc.net/uploads/1/3/0/5/130540874/9740727.pdf
    • http://freakflagfilms.com/uploads/1/3/0/6/130604459/zovupibigubilizevoti.pdf
    • http://myrolemodel.info/uploads/1/3/1/4/131483547/rilikepobo-rupuxeneweru-logabonitik.pdf
    • http://xam-exam.com/uploads/1/3/0/2/130289428/e6c4a914.pdf
    • http://sustainablythin.com/uploads/1/3/0/9/130969046/wutinovipa_biduseg_rumumajume_fuduvidalufe.pdf
    • http://andyshomeservices.com/uploads/1/3/0/7/130739131/80415c36.pdf
    • http://lavendergirlwellness.com/uploads/1/3/0/2/130271019/misijozo.pdf
    • http://mail.womenspregnancycenterofgalesburg.org/uploads/1/3/0/6/130604322/zapuvabuzi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007041.bin
d388703a73f3f2f257c014445fafe3e929b72c8d477870d79c9d1a60b35468a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7041 5052 bytes
font_01_sfnt_off00008189.bin
9b4778f261624c06f92d07c1a975e11f2d3381ad7d3651ff0cad0066bb040dee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8189 10944 bytes

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