Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f6a657f7b963c0…

MALICIOUS

PDF

34.1 KB Created: 2020-04-14 13:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7ed9efc342b709d9376320dfe98c768f SHA-1: d3d48484147fbbdb217ad19e1f7990ac2672739d SHA-256: 87f6a657f7b963c05c87193411f7a2bc617a1c6ec4b736d2c89ae7e9a8694211
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are to PDF files with numeric slugs, indicating a link farm or SEO abuse tactic. The document body, though partially corrupted, contains references to a 'lakeville weather report' and includes URLs that are likely part of this scheme. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to redirect users to potentially harmful content.

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://rehphotography.org/uploads/1/3/1/4/131437198/131437198.html#lakeville+weather+report
    • http://theleadersoftheheart.com/uploads/1/3/0/6/130621388/mojobus_dulotizagaw.pdf
    • http://empleos.fun/uploads/1/3/0/7/130740232/rekupax.pdf
    • http://askyourkid.com/uploads/1/3/1/3/131379712/werufapo-jedik.pdf
    • http://tigernitemail.com/uploads/1/3/0/8/130813144/tonudisur.pdf
    • http://bullmountainbotanicals.com/uploads/1/3/0/6/130621313/ea800fd1b306.pdf
    • http://sativamedicinal.org/uploads/1/3/0/6/130640175/1627400.pdf
    • http://anointedkreations.com/uploads/1/3/0/2/130289724/58be9f34d8f5b.pdf
    • http://tizheartbeats.com/uploads/1/3/0/6/130621060/567e14db64.pdf
    • http://starkviller.com/uploads/1/3/0/2/130287815/9fd414e7049ec0.pdf
    • http://majesticmermaidboutique.com/uploads/1/3/0/2/130289363/4898523.pdf
    • http://krystadesigns.com/uploads/1/3/0/3/130323705/6e929612a8.pdf
    • http://bokstem.com/uploads/1/3/0/4/130435766/8148794.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_off00005cad.bin
07bdd88a93346530bc18288e5af63650cf6eef270d811e63dcdd75d5244d2ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAD 8304 bytes

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