Malicious PDF — malware analysis report

Static analysis result for SHA-256 39087e32420d7930…

MALICIOUS

PDF

32.8 KB Created: 2020-06-15 23:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dadf29f3eeb15fa396077f90c60f399 SHA-1: b875511028d1257deb15431318e02d05171fb4ec SHA-256: 39087e32420d79308985fe9cd4728e78e1b2a554a753e58c63c0860f3c2a3c23
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or redirection tactic. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are likely part of this link farm, potentially leading to further malicious content or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pittsburghhairsalons.com/uploads/1/3/0/2/130291707/130291707.html#sequence+patterns+worksheets
    • http://heatwavehits.com/uploads/1/3/0/6/130620752/gajavob-neratutupipape-kosemet.pdf
    • http://mta-sts.mx.chooserightly.com/uploads/1/3/0/9/130969580/df28de70525.pdf
    • http://davesirois.com/uploads/1/3/0/7/130775821/noberugapabuwev.pdf
    • http://charliesblendedcreationz.com/uploads/1/3/0/7/130776695/4982409.pdf
    • http://cvburd.com/uploads/1/3/1/3/131378791/jinabetawu.pdf
    • http://mxe.alldogobedience.com/uploads/1/3/0/2/130289668/zoxizefe-gilufo-rivug-zujekalubunurag.pdf
    • http://sharlenetoh.com/uploads/1/3/0/9/130969446/nugevoxunarex-bumotisikeli.pdf
    • http://webdisk.tarawattdesign.com/uploads/1/3/1/4/131437359/sapoxurofugejozare.pdf
    • http://identity-lifecoach.com/uploads/1/3/1/4/131411147/56977745.pdf
    • http://cpanel.vkinspections.com/uploads/1/3/0/4/130476573/zuvosamibib.pdf
    • http://autodiscover.broedell.com/uploads/1/3/0/6/130621818/9487237.pdf
    • http://texas-tea.square.site/uploads/1/3/0/6/130604133/67e5d7c2e.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_off0000573e.bin
91f523c04153b810d6c6c3d99d34da2a7cc79823a230cadea3f15bdee054e42d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x573E 9688 bytes

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