Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3faed98b4dd969…

MALICIOUS

PDF

42.4 KB Created: 2020-04-05 06:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f62b672705a618f1e6ff9ed66a8b4201 SHA-1: ef71651e0a63ccb7f921b6740c70ed6366edf681 SHA-256: ae3faed98b4dd96901da4ebfebc9a84e2496ce238ec2aeddf966a76601080f14
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, many of which follow a pattern suggestive of SEO spam or a link farm. The primary heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, with 'perrottalawfirm.com' being a dominant host. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs are likely used to redirect users to malicious content or phishing sites.

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://heavenscents786.com/uploads/1/3/1/4/131484603/131484603.html#what+does+dpp+4+enzyme+do
    • http://perrottalawfirm.com/uploads/1/3/0/6/130622110/minol_pejugovig_boponadadane_zitiz.pdf
    • http://vacavilleselfstorage.org/uploads/1/3/0/7/130775561/6799821.pdf
    • http://swiftskies.com/uploads/1/3/0/2/130288893/c62e1.pdf
    • http://greenwoodcollectiveinvestment.com/uploads/1/3/0/9/130969182/d6ef26d.pdf
    • http://59ersband.net/uploads/1/3/0/6/130639563/nowiminowuniju_lejuwew_jemotolerale_wufutuw.pdf
    • http://thefoothillstrails.com/uploads/1/3/1/0/131069753/1331141.pdf
    • http://rangelandresourcegroup.com/uploads/1/3/0/3/130379482/wefasavobuxiweb.pdf
    • http://alaska4h.com/uploads/1/3/0/7/130776872/9875544.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_off00007c98.bin
a15092dc201273672134a44f3f8146aec8d888ed719529de6fc99add51bcb50b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C98 8116 bytes

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