Malicious PDF — malware analysis report

Static analysis result for SHA-256 0debedbaf75955d4…

MALICIOUS

PDF

39.9 KB Created: 2020-03-20 11:33:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6c9a69d67f9d7430fca1540dceab3c64 SHA-1: 4d5db2590b028828c7cfc53542a70cb575524d5a SHA-256: 0debedbaf75955d46da5e766672722422ce7d1da54d110b29eed24f876bb58f3
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs pointing to external PDF files across numerous domains. This behavior is indicative of a link farm or SEO spam campaign, designed to artificially inflate search engine rankings or distribute content. While no specific malicious script was extracted, the ML classifier and the heuristic for a PDF link farm strongly suggest malicious intent, likely related to driving traffic or potentially hosting 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://armorgrind.org/uploads/1/3/0/4/130476976/130476976.html#como+se+formula+el+titulo+de+la+investigacion
    • http://mymagnificentmess.com/uploads/1/3/0/4/130476288/wizokosojiderabiwavu.pdf
    • http://so-wellscatering.com/uploads/1/3/1/1/131164372/7305896.pdf
    • http://thewolvesandtheraven.co.uk/uploads/1/3/0/6/130620887/8f891.pdf
    • http://firstollie.org/uploads/1/3/0/5/130590308/rewuxunowenubef.pdf
    • http://heartofwellbeing.org/uploads/1/3/0/5/130550714/7138b2b20a6dd.pdf
    • http://skyflyr.net/uploads/1/3/0/5/130588679/xamogitobevuga.pdf
    • http://74-123-76-117.mgwnet.com/uploads/1/3/0/7/130775388/3313228.pdf
    • http://refugedajourney.com/uploads/1/3/0/5/130544889/6683089.pdf
    • http://grundycfb.com/uploads/1/3/0/7/130776131/kopalu-domesepaf-vakumem-sawegoxu.pdf
    • http://nexuschapel.org/uploads/1/3/0/5/130539300/sivakewarixaxomun.pdf
    • http://iconicburgers.com/uploads/1/3/0/5/130588477/e0d4725b2.pdf
    • http://www.heartlandgolfvillas.com/uploads/1/3/0/7/130738969/630e9db941677.pdf
    • http://thepowergroupnc.com/uploads/1/3/0/6/130639812/9056184.pdf
    • http://brhardwood.com/uploads/1/3/0/6/130620841/759138.pdf
    • http://serpicodevhr.com/uploads/1/3/0/2/130289629/78122.pdf
    • http://reykphotography.studio/uploads/1/3/0/5/130590019/zazanivuxurem.pdf
    • http://realestatemagazine.us/uploads/1/3/0/5/130550982/tufanujula.pdf
    • http://artiespectorsucks.org/uploads/1/3/0/4/130483514/kasowamavabi.pdf
    • http://datefame.com/uploads/1/3/0/8/130814717/zogobok.pdf
    • http://www.hendrix-painting.com/uploads/1/3/0/6/130640132/d38d5d7b13b7.pdf
    • http://reneedunbar.com/uploads/1/3/0/2/130288514/271119.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_off00007132.bin
4bc7ec1a9fd608f0ff5db7ba2101749cb9c021b696e98d1bf5b847246259fc95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7132 9168 bytes

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