Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddcae2e1bd8d920…

MALICIOUS

PDF

35.0 KB Created: 2020-06-07 01:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f90544570b38ac4fad1cc4a5331a3b6e SHA-1: 513e899b63451f7de10fbde1f030dc75da24fa1e SHA-256: dddcae2e1bd8d920feeabb70409856b2ff2b8f6a6b74dd55a0429d349d617e25
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, many of which are hosted on domains that appear to be part of a link farm. The document body, though partially corrupted, contains text related to 'Tratamiento de candidiasis en hombre' and references wkhtmltopdf, suggesting a lure to trick users into visiting these sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://mta-sts.mx.sammysdogwalking.com/uploads/1/3/0/2/130289749/130289749.html#tratamiento+de+candidiasis+en+hombre
    • http://farmhousets.net/uploads/1/3/1/4/131407300/8310b481f23.pdf
    • http://espacemathias.com/uploads/1/3/0/6/130639883/a6141ab6069.pdf
    • http://bloodspirits.com/uploads/1/3/1/8/131871419/4959962.pdf
    • http://maiinteriors.com/uploads/1/3/0/6/130604476/62326a9.pdf
    • http://hostmaster.synergyhairandbeautyelloughton.co.uk/uploads/1/3/1/3/131381288/b00bb198b3.pdf
    • http://webmail.hunnydoranch.com/uploads/1/3/1/1/131164273/juwitejivunoviz_lijupe.pdf
    • http://elevatedmorsel.com/uploads/1/3/0/5/130588203/pumasusi_lelobudusij.pdf
    • http://mta-sts.dc-f81edea13abf.kidezetherapy.com/uploads/1/3/1/6/131606057/7104041.pdf
    • http://pawsacrosstheborder.net/uploads/1/3/0/7/130776411/mefika.pdf
    • https://poginuwikola.files.wordpress.com/2020/06/50087632796.pdf
    • https://refifiv.files.wordpress.com/2020/06/26536110321.pdf
    • https://dawedigukas920094907.files.wordpress.com/2020/06/fageb.pdf
    • https://wazutiwivagu.files.wordpress.com/2020/06/30542508342.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_off00005c04.bin
e0b6c058750f388941d2da11416d7bbf20a68a9b6356857f81a53be2c5d5172c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C04 10760 bytes

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