Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72897eb72f85624…

MALICIOUS

PDF

35.9 KB Created: 2020-03-21 15:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 11cc9d1d287c6b355f539ac7b17924fb SHA-1: 2f22757611982b5debe89793df7c9f9de73c2583 SHA-256: b72897eb72f8562422f6de9cfc7745cf5bb38caa21b26af039680f688eccd850
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric slugs, suggesting a link farm or SEO poisoning tactic. The document body, though partially obfuscated, references 'Corel draw definicion pdf export settings' and includes numerous URLs pointing to seemingly unrelated domains, likely to manipulate search engine results and lure unsuspecting users to malicious content. The ML classifier strongly indicated maliciousness.

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://floralfaeriedesigns.com/uploads/1/3/0/6/130620948/130620948.html#corel+draw+definicion+pdf+export+settings
    • http://chuckwilliams.us/uploads/1/3/0/6/130621507/divisofokoguje_tugifubuwul_ribuzerup_medolaz.pdf
    • http://adamblackwood.co.uk/uploads/1/3/0/7/130776249/ef5a355670ff.pdf
    • http://hq.school/uploads/1/3/0/4/130488779/tulof-kinegisob.pdf
    • http://newsmapper.org/uploads/1/3/0/8/130814178/7566369.pdf
    • http://barkerkindergardens.com/uploads/1/3/0/8/130814126/243138.pdf
    • http://terbiumprice.com/uploads/1/3/0/3/130379445/7351734.pdf
    • http://mta-sts.mx.derekepperson.com/uploads/1/3/0/8/130874429/90f002f.pdf
    • http://anewdaydesigns.com/uploads/1/3/0/4/130488469/jirodike.pdf
    • http://luckofseven.net/uploads/1/3/0/4/130478261/9b7aa98cddb.pdf
    • http://portableoxygen.us/uploads/1/3/0/7/130739170/kobapemewelokorus.pdf
    • http://techbitdaily.com/uploads/1/3/0/5/130539758/3805767.pdf
    • http://hostmaster.tufftests.com/uploads/1/3/0/7/130775984/zutizipagaxizitema.pdf
    • http://theg-lamp.com/uploads/1/3/0/5/130551390/8d3ca91f91df.pdf
    • http://insureapplemacbook.com/uploads/1/3/0/7/130740089/ac6afde9ffc204.pdf
    • http://mrlapta.com/uploads/1/3/0/6/130620482/dasesujidazutusaze.pdf
    • http://alexistrucking.com/uploads/1/3/0/5/130542922/kanubava.pdf
    • http://bestsoftballuniforms.com/uploads/1/3/0/9/130969160/3961396.pdf
    • http://healthprofessionals4u.com/uploads/1/3/0/7/130775107/8494955.pdf
    • http://shopbluebridge.com/uploads/1/3/0/4/130475979/682586.pdf
    • http://stemuddannelse.com/uploads/1/3/0/8/130813859/xijuzojeduxos.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_off000064bc.bin
34f16b35d4b65a5d3042b663ed8f02dbf2d56f236699850874312fbe56448643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BC 7444 bytes

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