Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b7fa29061e2487…

MALICIOUS

PDF

31.5 KB Created: 2020-04-05 13:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4149760fcbe246e98a716808ad2b8ddb SHA-1: c355da6fe5a9f0fbc1291dd3d3778e9c25e519f8 SHA-256: 05b7fa29061e248770ddc946c3475db7278f54778a0cd31b2a3bb1aa55afefdd
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, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were directly extracted, the embedded links are the primary indicators of malicious intent, likely serving as a distribution mechanism for further compromise.

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://smokin.tires/uploads/1/3/0/5/130590531/130590531.html#que+es+el+presente+simple+del+indicativo+historico
    • http://eandjtile.com/uploads/1/3/0/8/130814347/joziwagusopamag.pdf
    • http://meantrade.com/uploads/1/3/0/4/130476385/taromoluf_todoriwuxebub_mebirepageb.pdf
    • http://rcbadvisors.net/uploads/1/3/0/3/130379625/dubufal-janenogixug-xefitagi-wipeze.pdf
    • http://ivibuildingservicesptyltd.com/uploads/1/3/0/7/130738619/3284703.pdf
    • http://peelian.net/uploads/1/3/0/6/130620431/gugibegu.pdf
    • http://davisdesigns307.com/uploads/1/3/1/4/131437593/1393234.pdf
    • http://studio-backstage-paris.com/uploads/1/3/0/3/130324416/fufinakoxamurodufop.pdf
    • http://allisondonohuewrites.com/uploads/1/3/0/9/130969847/pedumomuvurukim-pujemovedulojaf-lozitakemaga.pdf
    • http://permacultureatlanta.com/uploads/1/3/1/0/131070161/7077375.pdf
    • http://supportserbia.com/uploads/1/3/0/8/130874065/viputaginijibed.pdf
    • http://massagetherapysc.com/uploads/1/3/0/9/130969368/f0eaba9c9f62.pdf
    • http://deliciousnessinyourmouth.org/uploads/1/3/0/6/130640081/82215ea6b37.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_off0000532d.bin
0da218271882446f6b071019f2cf46f85c7ed10e9c9b9ddeb6db568b7a4026f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x532D 7496 bytes

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