Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b10730fd0e28e9…

MALICIOUS

PDF

37.7 KB Created: 2020-03-10 05:26:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 16b1a1eed4ab207029a8716b0cb608f4 SHA-1: b259d35b632f416275f7bec1ba6944b13719276a SHA-256: d6b10730fd0e28e90ba5f9e7cca27b937ecb1c730512ef712de8e820e5686e81
94 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary link found is http://5pointauto.com/uploads/1/3/0/8/130874379/130874379.html#superior+labrum+repair+cpt. This suggests the document is designed to redirect users to potentially harmful content hosted on these external sites.

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://5pointauto.com/uploads/1/3/0/8/130874379/130874379.html#superior+labrum+repair+cpt
    • http://webmail.anzode.com/uploads/1/3/0/6/130621956/9436936.pdf
    • http://www.schoolforcooks.com/uploads/1/3/0/5/130545429/a6d6fe8af.pdf
    • http://www.classiccartoons.org/uploads/1/3/0/5/130551576/5197133.pdf
    • http://kabloompeople.com/uploads/1/3/0/8/130874569/vubimiwob.pdf
    • http://stevesays.com/uploads/1/3/1/1/131164257/580c7efc5.pdf
    • http://www.melbournecaulkingservice.co/uploads/1/3/0/5/130590305/5764e5020c2b.pdf
    • http://yourrentalexpert.com/uploads/1/3/0/3/130324419/dijigavekivekepe.pdf
    • http://www.untoldrunnercoaching.com/uploads/1/3/0/4/130476481/50d6d35c.pdf
    • http://proveedoradeplacasytechos.com/uploads/1/3/0/4/130489253/wemura_senolodu.pdf
    • http://enconcommercialsandiego.com/uploads/1/3/0/3/130313120/lisaba-nevomejogibira-binuvelu-vikufokogoropa.pdf
    • http://arapahoepainting.com/uploads/1/3/0/7/130775762/sogiwudugunekebajoki.pdf
    • http://poynorhealthandwellness.com/uploads/1/3/0/2/130271072/varitulujorerubado.pdf
    • http://all-car-parts.net/uploads/1/3/0/6/130621351/d174a9744ee40d.pdf
    • http://collegevideogame.com/uploads/1/3/0/5/130539267/d0ecb878fd777f2.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_off00006b3b.bin
c3be62fcecf796ab3f27d3246026051dc743b919cc56f38acf92fbaa34e6e1ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3B 7824 bytes

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