Malicious PDF — malware analysis report

Static analysis result for SHA-256 5599ecaa7c059449…

MALICIOUS

PDF

50.3 KB Created: 2020-03-22 12:20:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cfa187f17775b5a17a828397fec5b039 SHA-1: 270c9daa13bd0370e831337d0786b3eb202ab232 SHA-256: 5599ecaa7c0594494e8b4ef399771b78e64d338b1c3e6bf84d0ea043e9fc1949
94 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with a significant number of embedded URLs pointing to various domains. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, suggesting the document's primary purpose is to distribute links, likely for SEO poisoning or to lure users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://bloodblisterapparel.com/uploads/1/3/0/5/130589057/130589057.html#spontaneous+reaction+delta+g
    • http://carterskennel.com/uploads/1/3/0/7/130739141/pebinawesonofup_jizubotijageze.pdf
    • http://broncweb.com/uploads/1/3/0/6/130604549/dbc77fe22f9.pdf
    • http://shannanstanciuforschoolboard.com/uploads/1/3/0/6/130620557/f1cd30c.pdf
    • http://zendreaming.com/uploads/1/3/0/5/130588721/822b127e25cd.pdf
    • http://travelwithpapino.com/uploads/1/3/0/4/130476505/e8233515c.pdf
    • http://myrole.consulting/uploads/1/3/0/4/130476697/f6e03a7cda6225d.pdf
    • http://www.artisticcreationsbycarma.com/uploads/1/3/0/5/130539440/2f29f2bedb48b5b.pdf
    • http://stephenknighttattoo.com/uploads/1/3/0/2/130288394/tilaxuliledipaxefora.pdf
    • http://remzmusic.org/uploads/1/3/0/2/130274338/c07129.pdf
    • http://sailsea.org/uploads/1/3/0/6/130621344/xolilowagazeg.pdf
    • http://nocritter.com/uploads/1/3/0/9/130969817/1d7b40b46b6158.pdf
    • http://www.ancient-hearts.com/uploads/1/3/0/7/130738890/tijik.pdf
    • http://hermitagefarmgrandgala.com/uploads/1/3/0/6/130604872/2625164.pdf
    • http://perumarket.net/uploads/1/3/0/5/130551155/adc8cdc.pdf
    • http://www.jerzeyfreshsalons.com/uploads/1/3/0/8/130874192/4835432.pdf
    • http://libertadmarketing.net/uploads/1/3/0/7/130776874/ragotosuzelu_juxuwolotomux_zosasuv_gexib.pdf
    • http://johncrossmobilehairdressing.co.uk/uploads/1/3/0/7/130739144/6cd1c.pdf
    • http://aconvergentinvestment.com/uploads/1/3/0/6/130605076/gasal.pdf
    • http://sequoia77.pleasingfood.com/uploads/1/3/0/6/130620454/kamomefizevevax.pdf
    • http://dfwprints.com/uploads/1/3/0/5/130588874/lofugonojopibezase.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008568.bin
20aa8ef94651ac59843ece3256accf60886996096dcf45d6e76f60e365e468df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8568 8652 bytes
font_01_sfnt_off0000a6d1.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D1 16036 bytes

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