Malicious PDF — malware analysis report

Static analysis result for SHA-256 13acb246960f8e1e…

MALICIOUS

PDF

38.3 KB Created: 2020-04-02 04:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4ae95f83c90b10c9758207be3feae899 SHA-1: b7dfd4a2e31a968dd74aa25bc3f584d0baf1a83c SHA-256: 13acb246960f8e1e3debcfc75b269c82ab5aaccd415dc4162363502df8ce4078
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text appears to be obfuscated or corrupted, but the presence of numerous external links suggests a malicious intent, possibly to manipulate search engine results or distribute further malware. No scripts were extracted from this sample.

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://kohno-corp.com/uploads/1/3/1/4/131437261/131437261.html#curriculo+educacion+fisica+primaria+extremadura
    • http://joyouskindredgoods.com/uploads/1/3/0/8/130874430/478ec1d073f8.pdf
    • http://thehair.com/uploads/1/3/0/9/130969791/nipafipaw.pdf
    • http://thehoopmovement.com/uploads/1/3/0/9/130969160/vuwaboxefumudem.pdf
    • http://transgendermakeover.com/uploads/1/3/0/5/130546717/3000239.pdf
    • http://balticsportsciencesociety.com/uploads/1/3/0/9/130969330/862577.pdf
    • http://haydencolebredbenner.com/uploads/1/3/0/6/130604902/9719472.pdf
    • http://littledarlingscookieco.com/uploads/1/3/0/4/130436085/48910.pdf
    • http://hiddenfocus.org/uploads/1/3/1/4/131406816/899f2f2039.pdf
    • http://corbinwescott.com/uploads/1/3/0/5/130588858/gumodavamut-datoporow.pdf
    • http://mvptransfergreece.com/uploads/1/3/1/3/131379312/4db7650dcafe.pdf
    • http://baddogshop.com/uploads/1/3/0/6/130604681/7947343.pdf
    • http://gqtrav.com/uploads/1/3/0/6/130605217/7990406.pdf
    • http://jacarlsontrumpet.com/uploads/1/3/0/8/130814387/1267853.pdf
    • http://ahle-sunnah-wa-suffiya.com/uploads/1/3/0/6/130640116/531834.pdf
    • http://mswilliamsonline.com/uploads/1/3/0/6/130639740/4858259.pdf
    • http://megapixelchiefgames.com/uploads/1/3/0/3/130313179/2cdd850af2a.pdf
    • http://newbioconsulting.com/uploads/1/3/1/1/131164406/6ee854eabb2.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_off00006cbc.bin
675da2f119f3c89cc11f38427388a29258af2119e80a667f015fdda4c49ed09c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBC 8048 bytes

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