Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c8ad053002a6c2…

MALICIOUS

PDF

37.0 KB Created: 2020-03-11 03:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a47d3925f03211abaed19d19a5af0efe SHA-1: 0f18fcd8eaf6cc1bf26f9a3323d0a6f2365073e8 SHA-256: 78c8ad053002a6c28a281f40abd2de28f913d8ba6752946c3964ba62841ce07a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of embedded external links to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves directing users to these external resources, which could be used for SEO spam or to host further malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://webdisk.jessicamiyuki.com/uploads/1/3/0/7/130775742/130775742.html#barber+adagio+for+strings+leonard+bernstein
    • http://bigcourageouslove.com/uploads/1/3/0/5/130589049/lebejawirux.pdf
    • http://velofixsvevent.com/uploads/1/3/0/6/130620267/sakuju_bipotijadarofuw.pdf
    • http://xbee.info/uploads/1/3/0/4/130476158/jaxugipe.pdf
    • http://antiageingsolutions.com/uploads/1/3/0/6/130621985/lezutulutubakeduvus.pdf
    • http://icybbkollection.com/uploads/1/3/0/5/130589180/9502279.pdf
    • http://f1fantasyseason.com/uploads/1/3/0/5/130589000/ropeloxux.pdf
    • http://www.omahawagstoriches.org/uploads/1/3/0/9/130969343/ziwuzawubev.pdf
    • http://www.stanleycustomhomes.com/uploads/1/3/0/6/130621545/760c0eb6254bf84.pdf
    • http://kaynakakademisi.com/uploads/1/3/0/7/130739117/835f5a3.pdf
    • http://www.nbarmichigan.com/uploads/1/3/0/8/130814591/nuwirejanorelaporo.pdf
    • http://randomchorus.com/uploads/1/3/0/6/130621548/dofulo.pdf
    • http://theporterauthority.com/uploads/1/3/0/6/130620635/4e248f91.pdf
    • http://mulfordorthodontics.com/uploads/1/3/0/8/130814588/3d4f3264183e9.pdf
    • http://konzacoffeecompany.com/uploads/1/3/0/4/130435784/3822589.pdf
    • http://designer-inc.com/uploads/1/3/0/6/130604757/3748631.pdf
    • http://djrockyjr.stream/uploads/1/3/0/3/130379113/ropisevasug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e8b.bin
0a14476afb87d7b9737c4aec5a7e82853ac36a43d6933f24a5c5419ec8fa3171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8B 7924 bytes
font_01_sfnt_off00007d01.bin
1b3f82cd74c5b6671cc0c0d4a6c7877b74bb57ca469b2a61ef541918e41af838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D01 2652 bytes

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