Malicious PDF — malware analysis report

Static analysis result for SHA-256 db60375adda95ac7…

MALICIOUS

PDF

53.8 KB Created: 2020-03-14 23:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b0389a9fe2481dc2918687074083112 SHA-1: 8a796b097fa59b195f6a82abd50a7aaec097e0d8 SHA-256: db60375adda95ac76e8586aa41a8ad23d5cc3a1058cdc6535bd85e614285adf8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a large number of external links, a common tactic for SEO poisoning or phishing. The document body text, though heavily obfuscated, contains a lure related to 'atopic eczema treatment nice guidelines' and references wkhtmltopdf, suggesting it was generated programmatically. The ML classifier strongly flagged this PDF as malicious. The primary intent appears to be directing users to malicious external sites via the numerous embedded links.

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://uxd66r.bdgct.com/uploads/1/3/0/5/130551198/130551198.html#atopic+eczema+treatment+nice+guidelines
    • http://baisnochum.com/uploads/1/3/0/6/130639962/jufigiti.pdf
    • http://maestrovincenzo.net/uploads/1/3/0/4/130436288/3465265.pdf
    • http://oliviadummer.com/uploads/1/3/0/3/130313161/pipel-gafam.pdf
    • http://janwindle.com/uploads/1/3/0/8/130874647/kokopofovekux-tulinuwoleliwif-debikig-newufazolup.pdf
    • http://mta52.somekindofsimple.com/uploads/1/3/0/2/130274028/kidazenofuwub.pdf
    • http://mx.shewolfattackteam.com/uploads/1/3/0/9/130969259/zuvif.pdf
    • http://www.satisfiedwithsolar.com/uploads/1/3/0/2/130272353/b6459722a.pdf
    • http://www.apexmetrix.com/uploads/1/3/0/5/130540082/pevubofuzu.pdf
    • http://www.dreambignationinc.com/uploads/1/3/0/5/130589222/pejovo-maboxolakajikad-zuvejik.pdf
    • http://graceweigallery.com/uploads/1/3/0/5/130539714/c1705239f95202.pdf
    • http://pizzabellarestaurant.net/uploads/1/3/0/4/130483766/nopalamativi-vedefovonuxowo-poselu.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_off0000aa86.bin
9cb267afa2a885bf993a028f7b08cdb58b0f8c52a8f63891ae1152e6eb5f55c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA86 7652 bytes

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