Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b027b01e6990590…

MALICIOUS

PDF

59.7 KB Created: 2020-04-12 00:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0dfe03761af0d9c3373d36364ff5bb43 SHA-1: eff218351848e5bf3b8256f3d19f2f80df6bc8aa SHA-256: 8b027b01e699059026f8c6db7b9bc260889811d19798d946d3399dea909bf36a
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or distribution network. The document body, though partially garbled, contains text related to units of measurement and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to redirect users to potentially harmful content.

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://southernvermontcleaners.com/uploads/1/3/0/4/130483355/130483355.html#unidad+para+medir+la+fuerza+y+el+peso+en+el+sistema+ingles+de+medidas
    • http://lmconseils.net/uploads/1/3/0/2/130288462/7565560.pdf
    • http://lisagarcia-rivera.com/uploads/1/3/0/8/130874422/zajebasujek.pdf
    • http://calmcelebration.com/uploads/1/3/0/5/130543640/1329796.pdf
    • http://paternosterproductions.org/uploads/1/3/0/5/130541445/bebofovojogujem.pdf
    • http://lizbernardo.com/uploads/1/3/0/8/130814100/golugigur.pdf
    • http://rochestermnblinds.com/uploads/1/3/0/8/130813539/2049939.pdf
    • http://thebeautycave.net/uploads/1/3/0/5/130588658/12eb7b6.pdf
    • http://hairbyandrewschmitz.com/uploads/1/3/0/9/130969129/galusu_kesili.pdf
    • http://sheworksavl.org/uploads/1/3/1/4/131407067/6907677.pdf
    • http://fsuseniorhealth.org/uploads/1/3/1/4/131453026/7106735.pdf
    • http://fsuseniorhealth
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009cdd.bin
8683025f67f91d45356b8768377b4e6d4b996f67330620c0e061eb451cf761b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CDD 10140 bytes
font_01_sfnt_off0000c132.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC132 2652 bytes
font_02_sfnt_off0000ca99.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA99 16036 bytes

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