Malicious PDF — malware analysis report

Static analysis result for SHA-256 f074b1ae1b1a82b6…

MALICIOUS

PDF

36.3 KB Created: 2020-06-18 09:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce486066f3889cb7a197a8b26cc2e31a SHA-1: 783c1811eec07749eb53c1ffda0c5ec025d426e7 SHA-256: f074b1ae1b1a82b60372041fbe91183a9939b4b0592685a438757d246718c11c
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links to various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous URLs suggests a delivery mechanism for further malicious content or phishing attempts. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://store.healmarketplace.com/uploads/1/3/0/2/130289546/130289546.html#the+purpose+of+writing+pdf
    • http://larsonmediation.com/uploads/1/3/0/8/130813401/5145573.pdf
    • http://daytonmlslasertherapy.com/uploads/1/3/1/3/131398104/jotunojizevesemod.pdf
    • http://mazila.co.za/uploads/1/3/1/6/131637558/3c67de7f634b73.pdf
    • http://nikitaflynnphotography.com/uploads/1/3/0/8/130874088/9160853.pdf
    • http://mynapervillecpa.com/uploads/1/3/1/3/131379939/6412256.pdf
    • http://sophistable.com/uploads/1/3/1/3/131383646/lifozasaj.pdf
    • http://kathywilliamstolstrup-lpc.com/uploads/1/3/0/2/130289623/kusuvaxixus.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005454.bin
73032619e3ef34e34c5f8b03548bed6f0e1292c056209e5e502dde14a344ee7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5454 4984 bytes
font_01_sfnt_off0000654f.bin
64d84562955b9f5dded8c31aa3b97c63dbd207cd650c39bf1afa7fdea110cfa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654F 9532 bytes

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