Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d01b41b41ec3a81…

MALICIOUS

PDF

31.7 KB Created: 2020-04-11 05:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 39ccdc1d19caee834c17880f900d1028 SHA-1: 6a0eddfce298085ba9c08ac526d7414d25b4d865 SHA-256: 2d01b41b41ec3a810fe519093d39c1ea34a1f8a0450e5107f560b729700a7b26
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'The commercial greenhouse 2nd editio' and includes several URLs, reinforcing the link farm attack pattern. The primary purpose appears to be directing users to a multitude of external resources, potentially for SEO spam or to host further malicious 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://clucktruckportland.com/uploads/1/3/0/9/130969841/130969841.html#the+commercial+greenhouse+2nd+editio
    • http://primetco.com/uploads/1/3/0/7/130738731/1360290.pdf
    • http://christinecorpuz.com/uploads/1/3/0/2/130272396/bekugujewuvepil.pdf
    • http://thyroidosaurus.com/uploads/1/3/0/6/130621127/xejalagipovupi_zuwenubaruvik_venotero_tezekejugelazu.pdf
    • http://hawaiibachataexpo.com/uploads/1/3/1/4/131437806/jesabinakivagoron.pdf
    • http://stansboard.com/uploads/1/3/0/2/130272505/gaguxi.pdf
    • http://whisperingwillowsalpacas.net/uploads/1/3/0/8/130814680/fujisibaxibudeb.pdf
    • http://pictimagery.com/uploads/1/3/0/4/130483290/6038569.pdf
    • http://doggydetailhi.com/uploads/1/3/1/6/131637714/ximamigefi.pdf
    • http://icg.solutions/uploads/1/3/1/4/131405977/2934689.pdf
    • http://pakistanicomedian.com/uploads/1/3/0/7/130776032/miwojizegusedawofazi.pdf
    • http://quwati.com/uploads/1/3/0/7/130739680/sesaxuxow.pdf
    • http://holygroundsonline.com/uploads/1/3/0/2/130270904/edf859.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_off00005545.bin
f2e0eb9087350e60078c8264cbdf51cfba86d41a2bfec4f1161761100b9f3e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5545 7508 bytes

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