Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec2fb9a6a671c36…

MALICIOUS

PDF

44.4 KB Created: 2020-03-09 09:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 52850533c0dcf2c6245f9d4d111b0451 SHA-1: d237db70fa80575bbe81abdefaf146be78a5cc73 SHA-256: cec2fb9a6a671c365da99bb1b00d12c03c76ee5e2d2cc9efa1c97fc4bc4aa137
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body text, though partially corrupted, contains references to URLs that are also present in the list of extracted URLs. This suggests the primary function of this PDF is to redirect users to a network of websites, likely for SEO spam or to host further malicious content.

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://i05g5.salon225.com/uploads/1/3/0/5/130543045/130543045.html#rpn+fmea+scale PDF link annotation
    • http://bestkidsmentoring.org/uploads/1/3/0/5/130589373/lavapix_dufawijamuso_liluwuvagure_wajonete.pdfIn PDF document text
    • http://www.butcherknives.us/uploads/1/3/0/6/130639458/fixanupalulaxu.pdfIn PDF document text
    • http://kohltechwindows.com/uploads/1/3/0/7/130739129/warometa.pdfIn PDF document text
    • http://www.shannonglover.com/uploads/1/3/0/7/130740129/f6f2345.pdfIn PDF document text
    • http://natethehitmaker.com/uploads/1/3/0/2/130287394/1193c54d4da2.pdfIn PDF document text
    • http://knit1chicago.com/uploads/1/3/0/6/130605273/4c3b6d53bb55d.pdfIn PDF document text
    • http://munchandbagel.com/uploads/1/3/0/6/130604850/falijag.pdfIn PDF document text
    • http://beatexpansion.com/uploads/1/3/0/7/130776076/9915013.pdfIn PDF document text
    • http://skilledmanagers.com/uploads/1/3/0/5/130544131/2eb4f.pdfIn PDF document text
    • http://actingcoachlasvegas.com/uploads/1/3/0/6/130640125/4742b5bf2e8e8.pdfIn PDF document text
    • http://apapainting.com/uploads/1/3/0/5/130588574/8ce5a3efc96.pdfIn PDF document text
    • http://ki5fao.com/uploads/1/3/0/5/130590561/nulinopifuzilo.pdfIn PDF document text
    • http://consenvest.com/uploads/1/3/0/2/130287553/acfd5a2995d2ee.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3A 7980 bytes
SHA-256: 5fcab67d3eac3a64893c318cfdb11314056de8f8098ba3c5cf5e70e86e3af73d
font_01_sfnt_off00008e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0A 16204 bytes
SHA-256: f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d