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) First seen: 2020-09-24
MD5: 250dc746bffb2380a5cb41125e9a64ce SHA-1: f6f029fbf2151734e927ecb579e6fef809a7cec6 SHA-256: 817257394dc73249584c87af7443b86d5548dfd97f8f1bde7f1ca0e73de186d5
96 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its extensive use of external links, a technique often employed in SEO poisoning or phishing campaigns. The document body, though heavily obfuscated, contains numerous URLs pointing to various domains, suggesting an attempt to redirect users to potentially harmful content or further stages of an attack. The ML classifier strongly supports the malicious verdict.

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 PDF link annotation
    • http://cpanel.castleislandcamps.com/uploads/1/3/0/5/130550774/1780694.pdfIn PDF document text
    • http://carpenterhomesllc.net/uploads/1/3/0/5/130540874/9740727.pdfIn PDF document text
    • http://freakflagfilms.com/uploads/1/3/0/6/130604459/zovupibigubilizevoti.pdfIn PDF document text
    • http://myrolemodel.info/uploads/1/3/1/4/131483547/rilikepobo-rupuxeneweru-logabonitik.pdfIn PDF document text
    • http://xam-exam.com/uploads/1/3/0/2/130289428/e6c4a914.pdfIn PDF document text
    • http://sustainablythin.com/uploads/1/3/0/9/130969046/wutinovipa_biduseg_rumumajume_fuduvidalufe.pdfIn PDF document text
    • http://andyshomeservices.com/uploads/1/3/0/7/130739131/80415c36.pdfIn PDF document text
    • http://lavendergirlwellness.com/uploads/1/3/0/2/130271019/misijozo.pdfIn PDF document text
    • http://mail.womenspregnancycenterofgalesburg.org/uploads/1/3/0/6/130604322/zapuvabuzi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7041 5052 bytes
SHA-256: d388703a73f3f2f257c014445fafe3e929b72c8d477870d79c9d1a60b35468a9
font_01_sfnt_off00008189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8189 10944 bytes
SHA-256: 9b4778f261624c06f92d07c1a975e11f2d3381ad7d3651ff0cad0066bb040dee