Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d01c96e7c5711c…

MALICIOUS

PDF

43.6 KB Created: 2020-04-03 13:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b46a346b6259d1c1c4779b7283e15f9f SHA-1: 489d3dc66951c1bd398503cd31c19b33beb48e7e SHA-256: 78d01c96e7c5711c122ca179e3b988407eb0e4da610357261939c5f943c397b0
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a link farm or SEO spam tactic. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links. While no scripts were directly extracted, the structure suggests a malicious document designed to redirect users to potentially harmful content hosted across many domains.

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://garstanghouseofmakeup.com/uploads/1/3/0/3/130379430/130379430.html#turning+radius+of+semi+truck+with+trailer
    • http://nordicactiongroup.com/uploads/1/3/1/3/131379163/0cc108dc62.pdf
    • http://vaxholmpaintball.se/uploads/1/3/0/8/130813883/3405221.pdf
    • http://bottlingplas.com/uploads/1/3/0/7/130776656/vogexuvanazalo.pdf
    • http://selectinsurancesvcs.com/uploads/1/3/0/4/130476556/roxiruk_kagolijerugij.pdf
    • http://tatmanrealestate.net/uploads/1/3/0/9/130969097/bagiwajevimi.pdf
    • http://royaltybyrachel.com/uploads/1/3/0/9/130969216/2006183.pdf
    • http://marksdieker.com/uploads/1/3/0/8/130813528/9296996.pdf
    • http://cagedchicken.com/uploads/1/3/0/2/130272631/b69c90.pdf
    • http://paularyanbookkeeper.com/uploads/1/3/0/3/130379202/6201889.pdf
    • http://infinitycyclingconsulting.com/uploads/1/3/0/9/130969718/42ea2de6068d.pdf
    • http://eyelashes4cars.com/uploads/1/3/1/4/131483034/9900893.pdf
    • http://grantspass-dayspa.com/uploads/1/3/0/6/130621665/9901350.pdf
    • http://6x6designbuild.com/uploads/1/3/0/6/130620964/gukazaw.pdf
    • http://alevelapps.com/uploads/1/3/1/4/131406300/makezipelim.pdf
    • http://rockssanddirt.com/uploads/1/3/1/1/131164355/lunibok_fewososebasawun_vigisudugen_zagazewed.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_off00007fef.bin
ec2f5d34ab3162e2cf0935ba84e4cbba4b945c6606e7b799cf7cc6d2e9a4fff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEF 8012 bytes

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