Malicious PDF — malware analysis report

Static analysis result for SHA-256 07279a23c8eeb66c…

MALICIOUS

PDF

38.3 KB Created: 2020-03-24 03:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1382d3545cad638dfad3c15a0fdc18c2 SHA-1: 682dc9a7747805bfec8e161d18b57f9d93f490cf SHA-256: 07279a23c8eeb66c883412139431044512afef312d68a877bd1a8f27a22c0395
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a PDF link farm. The ML classifier strongly indicated maliciousness, and the embedded URLs point to various PDF files on unrelated domains. This suggests a tactic to distribute content or potentially malware through a large number of SEO-optimized links.

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://ngtmedia.com/uploads/1/3/0/4/130476594/130476594.html#fases+de+planeaci%C3%B3n+del+proceso+de+capacitaci%C3%B3n+y+desarrollo
    • http://tcgplanet.com/uploads/1/3/0/5/130539842/jitige.pdf
    • http://kirillbondar.net/uploads/1/3/0/2/130272804/5119247.pdf
    • http://cretecapital.com/uploads/1/3/0/6/130605346/lamof.pdf
    • http://chippenhampositiveliving.com/uploads/1/3/0/2/130289284/3898026.pdf
    • http://oakhollowinc.com/uploads/1/3/0/5/130545254/2a92b96e367f54.pdf
    • http://counselingtechnology.info/uploads/1/3/0/7/130775145/resodid.pdf
    • http://hostmaster.wir-sind-oa.de/uploads/1/3/0/2/130274166/dce95d.pdf
    • http://researchforprogress.net/uploads/1/3/0/7/130776750/9dbce50f30654.pdf
    • http://themodestcollection.com/uploads/1/3/0/2/130270937/1734381.pdf
    • http://richmondtirerepair.com/uploads/1/3/0/8/130814118/vujoratoda.pdf
    • http://modyjiller.com/uploads/1/3/0/6/130639230/niguwemeziduma.pdf
    • http://holeinonesotogrande.com/uploads/1/3/0/4/130435986/6644997.pdf
    • http://chamoisinfo.com/uploads/1/3/0/5/130544001/vamawawebojov-tobare-tupopot.pdf
    • http://compassion4preemies.com/uploads/1/3/0/9/130969206/5245187.pdf
    • http://aiquiri.cz/uploads/1/3/0/7/130776228/tekiwubinuv_befolugasovajup_jezoteg.pdf
    • http://devonlamar.net/uploads/1/3/0/4/130489122/6117435.pdf
    • http://www.zephyrhome.com/uploads/1/3/0/6/130622059/aa4d1f83576.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_off00006bb3.bin
3eb04b02abdc28a5eb2e7b4eea0adf8b62f82127249368cbf6ba192c6d9cfb80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB3 7956 bytes

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