Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c65ba6bdc1a2fcb…

MALICIOUS

PDF

27.5 KB Created: 2020-04-13 15:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b7cdb961c4da017f76437c4b1c0aca7 SHA-1: 991cc527f63786c9e2deb1a6cfcca52a17154b3b SHA-256: 6c65ba6bdc1a2fcb3044a41f11147351d3b18700c860084caf82b1f2f9df6e58
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body text is garbled, but the presence of numerous URLs suggests a link farm or redirection scheme, potentially to distribute malware or for SEO manipulation. No scripts were extracted from this sample.

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://helpking.org/uploads/1/3/0/6/130620669/130620669.html#tablas+de+multiplicar+del+11+12+13+y+14
    • http://theministrynet.org/uploads/1/3/1/3/131384300/nibimi.pdf
    • http://barleysbeans.com/uploads/1/3/0/5/130551279/turon_wemelonuberopup_nijukipagi.pdf
    • http://icarechennai.com/uploads/1/3/0/2/130273803/zadirefonogudunikes.pdf
    • http://laurathamodonnell.com/uploads/1/3/0/4/130476795/tapab.pdf
    • http://sparklingcharm.ca/uploads/1/3/0/2/130287504/tedivus.pdf
    • http://spiegel-jezelf.com/uploads/1/3/0/5/130539416/35f8c001b49679b.pdf
    • http://blackmonmarshall.com/uploads/1/3/0/2/130270887/kigowukabojugij.pdf
    • http://williamdbrooks.com/uploads/1/3/0/3/130323554/gotojaje_wibizipi_bajoka_wesenugefi.pdf
    • http://casualmondayscomedy.com/uploads/1/3/0/5/130544067/keximivetub_lenogi.pdf
    • http://puravidadoula.com/uploads/1/3/0/6/130621250/9238642.pdf
    • http://leagueofthemask.com/uploads/1/3/1/0/131070045/nelukebuvaperusedox.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_off00004bbc.bin
c603c9c1e550eb7ea1fe064355d69623501d90098084d1c4947729446f5d5955		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BBC 5592 bytes

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