Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc752496d933973…

MALICIOUS

PDF

49.4 KB Created: 2020-03-22 05:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0fd20f897fa51571c5528a63b8b1bb0d SHA-1: 188727d81c8b74cc43540a69298205907885ebae SHA-256: 7cc752496d933973f990890d3fe92423c0cd5fdf5171432ae011011f7c2d1f5a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a link farm or SEO spam, with a high number of embedded external links pointing to other PDF files. The ML classifier strongly flagged this sample as malicious, and the PDF_SEO_LINK_FARM heuristic indicates a mass of external links. The primary attack pattern involves directing users to a large number of potentially malicious or misleading external resources.

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://exploringmicrobes.de/uploads/1/3/0/7/130740530/130740530.html#historia+del+futbol+femenino+chileno
    • http://diogenesfilms.com/uploads/1/3/0/5/130588389/jofizug.pdf
    • http://caringsmartagedcare.com/uploads/1/3/1/1/131163761/safisizuwoji.pdf
    • http://michaelfilipelli.com/uploads/1/3/0/7/130739232/latirapifup.pdf
    • http://www.harriesfamilyadventure.com/uploads/1/3/0/5/130547659/zigovefalubumovawumo.pdf
    • http://ajvincentproductions.com/uploads/1/3/0/7/130775331/suzotafewalen.pdf
    • http://nicollaslittleshop.com/uploads/1/3/0/5/130543538/tisoxigipolafow-kebunakanoz-mabovavijuz.pdf
    • http://churnminator.io/uploads/1/3/0/6/130620313/lonibebovigoden.pdf
    • http://ninejazz.com/uploads/1/3/0/7/130775245/7f11c0ff.pdf
    • http://imaginecare.net/uploads/1/3/0/6/130622111/pukewekupobijar_gufizosujuxu_josute_medoluvizogife.pdf
    • http://indruss.com.au/uploads/1/3/0/2/130272458/ludegiv_jeluk_vuzokebowo_ginadapememu.pdf
    • http://integraips.com/uploads/1/3/0/5/130539188/2bab0a349c1e08.pdf
    • http://elevate-data.com/uploads/1/3/0/2/130271143/vemozorefo.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_off000096ca.bin
94810a6bbe49b5718cfb12ba1374eb0153bd630bd96fbb83c1555332fa75aada		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96CA 8928 bytes

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