Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f987702168d3c54…

MALICIOUS

PDF

61.0 KB Created: 2020-05-08 18:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b778bf9bf55a45f84b7ff2753bc09f4 SHA-1: a27d65e0ea7f4f3b127709f050968e9e4e62a5fa SHA-256: 5f987702168d3c5467cd6a2379c113f0f8e6729720b199e2b5d0b631d6b152e8
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a tactic to manipulate search engine results or distribute malicious content. The document body, though partially obfuscated, includes a URL that appears to be part of this link farm. No scripts were extracted, but the presence of numerous external links and the ML classifier's high confidence indicate malicious intent, likely related to SEO spam or a content distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9043

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://midsussexmusiclessons.com/uploads/1/3/1/3/131379944/131379944.html#bonafide+certificate+format+in+marathi
    • http://thecreativetherapists.com/uploads/1/3/1/8/131856636/duxegadonujal-bulin.pdf
    • http://sharonleebridwell.com/uploads/1/3/0/5/130589179/livoz_mejalijebitu_limas_bidapasabive.pdf
    • http://tradvisory.com/uploads/1/3/0/6/130639683/deridejifawavufa.pdf
    • http://ggcarehome.net/uploads/1/3/0/9/130969312/votologab_todemakefol_suziwotaxeza_lijixiwi.pdf
    • http://arteducationdesign.com/uploads/1/3/0/4/130436258/jetepifu_dipefakom.pdf
    • http://islandgirls.ca/uploads/1/3/0/2/130270761/vozobebob_zufijati.pdf
    • http://ochanallc.com/uploads/1/3/1/3/131381677/gapikogiku_fexitoko_fasaxigowe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009af9.bin
8032611692419f23e8f58dac5ffbfcd1e57945b8bbc3aa9591e7dde33821baa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF9 8176 bytes
font_01_sfnt_off0000b745.bin
c200f6658dcb89805a01edb12732a34ac1440b038b8e87a69b26f5dda74518ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB745 16540 bytes

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