Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32a4ead91b165de…

MALICIOUS

PDF

43.3 KB Created: 2020-03-10 05:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1331090b133de22953d33e987f487217 SHA-1: 59f51d3a26f6c9a3b580d941cf1b5de200b1439b SHA-256: f32a4ead91b165ded6b91734ee8bab28bcd17822d3c479000a8d16575bcaca8d
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains garbled text and references to 'Ascaris diagram image', suggesting a lure. The primary function appears to be redirecting users to numerous external sites, likely for SEO spam or to host further malicious content.

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://noafconsultingservices.com/uploads/1/3/0/6/130621784/130621784.html#ascaris+diagram+image
    • http://vps23.pleasingfood.com/uploads/1/3/0/9/130969262/gimoxalixagebeta.pdf
    • http://mikepaganrealtor.com/uploads/1/3/0/7/130739712/luvoxotedijiso.pdf
    • http://www.ethicalfreshveganskincare.com/uploads/1/3/0/7/130775560/3175272.pdf
    • http://201words.com/uploads/1/3/0/4/130491852/sekibefapel.pdf
    • http://constructionwitnessexpert.com/uploads/1/3/0/3/130313026/7060402.pdf
    • http://ivflush.com/uploads/1/3/0/7/130738759/1b78f3e08a7b1.pdf
    • http://automatedsalesrocket.com/uploads/1/3/0/6/130639558/tawete.pdf
    • http://www.vibrationallyyours.com/uploads/1/3/0/5/130551456/1836153.pdf
    • http://fordreplacementkey.org/uploads/1/3/0/5/130589299/xurub.pdf
    • http://myeskimokisses.com/uploads/1/3/0/5/130588384/nuriwizepijapaj-lakixejaw.pdf
    • http://capecoddrycleaning.com/uploads/1/3/0/4/130483346/bezonajewumaxetovoji.pdf
    • http://ocbpropertyinspections.com/uploads/1/3/0/2/130291033/5651623.pdf
    • http://dirtydevillemusic.com/uploads/1/3/0/5/130550825/genokeku-loxopenubur.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_off00007f41.bin
d2b319abfb562956a2c70fc489df28a39d8769e3fe40b2745cb072b80bc3ac24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F41 8736 bytes

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