Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afe50082b4a886c…

MALICIOUS

PDF

38.9 KB Created: 2020-04-29 07:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a20c4585b62c6035def0ef34702ad5b9 SHA-1: f673f0a8d8a702689b744188fb2d70081efc4ce1 SHA-256: 7afe50082b4a886c2ceef3b0f671a2a1c560f858b8c20651a487c4e04089cd29
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This suggests a link farm or a mechanism for distributing further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure is consistent with SEO spam or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://symonsvalleyranch.com/uploads/1/3/0/7/130740174/130740174.html#string.+format+date+c
    • http://dukesroyalguard.com/uploads/1/3/0/4/130476347/rulipen-pumegavevilixo-zakejum.pdf
    • http://woodland-theatre.com/uploads/1/3/1/1/131164499/vakapewawigesimoji.pdf
    • http://yourkitchennutrition.net/uploads/1/3/0/4/130436521/juwajiroxanelon-jejubigopibuj.pdf
    • http://rangertx.gov/uploads/1/3/0/2/130289431/sesiwibelipigu-pemuxibuwor-zufade-nifefeduxuda.pdf
    • http://rccustomdoorsandrails.com/uploads/1/3/1/6/131637255/juvewatika.pdf
    • http://urban-resilience-benchmarker.com/uploads/1/3/0/3/130323967/gakovedewakelagowik.pdf
    • http://roomshakerrecords.net/uploads/1/3/0/3/130379135/mowibe_fejovod_zetiwi_faxaxo.pdf
    • http://customcreationshou.net/uploads/1/3/0/7/130738893/3662979.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d84.bin
2fb7de622909e5707a6c5b1535e552846b75f63d2cb4c6cabfc1d4bd2edf7095		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D84 7796 bytes
font_01_sfnt_off00007c32.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C32 16036 bytes

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