Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf25df69bbcad572…

MALICIOUS

PDF

45.3 KB Created: 2020-06-10 05:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 7ed4bfa76ee79e69da5d30b9371eaacf SHA-1: 53cb480add893bdfa3b5913c1624ee38e4aa56ae SHA-256: bf25df69bbcad572f6a79ab354d014f6e3c8c7c0dfab10c70a720b35742cae32
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a PDF SEO link farm heuristic, indicating a large number of external links designed to manipulate search engine results or redirect users. The document body contains numerous URLs, with the primary ones being http://en.gobrazil.co.uk/uploads/1/3/0/4/130435819/130435819.html#yunan+i%25CC%2587%25C3%25A7+sava%25C5%259F%25C4%25B1 and http://robertion.com/uploads/1/3/1/1/131164204/viperifu.pdf. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

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://en.gobrazil.co.uk/uploads/1/3/0/4/130435819/130435819.html#yunan+i%25CC%2587%25C3%25A7+sava%25C5%259F%25C4%25B1 PDF link annotation
    • http://robertion.com/uploads/1/3/1/1/131164204/viperifu.pdfIn PDF document text
    • http://bertschi.ca/uploads/1/3/0/4/130476844/9630d82369.pdfIn PDF document text
    • http://outlook.microendeavors.com/uploads/1/3/1/3/131398336/goxenuxu.pdfIn PDF document text
    • http://boatparty.org/uploads/1/3/0/9/130969150/wotinosat.pdfIn PDF document text
    • http://silvertonnaz.org/uploads/1/3/0/5/130551401/3732990.pdfIn PDF document text
    • http://itsjewelrytime.com/uploads/1/3/0/7/130739194/8409556.pdfIn PDF document text
    • http://2s6.undesirable.us/uploads/1/3/0/4/130483558/luvadifosazevab_kowogarogaz_viwanidapizewad_tovagejiti.pdfIn PDF document text
    • http://muellerprofessionalservices.ca/uploads/1/3/0/7/130740356/5286794.pdfIn PDF document text
    • http://cnxtaiwan.com/uploads/1/3/0/3/130313491/revuweti.pdfIn PDF document text
    • http://hanamakeup.studio/uploads/1/3/1/4/131455956/leposotilirem.pdfIn PDF document text
    • http://fairytalesandwar.net/uploads/1/3/1/4/131437689/xifusivusenijo_xosumuw_mavigotagipiru_fabokomi.pdfIn PDF document text
    • http://hellohappyday.com/uploads/1/3/0/6/130622025/vanuzifonivet.pdfIn PDF document text
    • http://kimauriemmadesigns.com/uploads/1/3/0/7/130738555/panopedudob-ripasex-tedigit.pdfIn PDF document text
    • http://markscarb.com/uploads/1/3/0/7/130738792/redosivij-makovapepo-fazubamorabex-wenib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wiginikinu.files.wordpress.com/2020/06/rifisutexufeviranojofuzup.pdfIn PDF document text
    • https://poxenatus.files.wordpress.com/2020/06/82940799791.pdfIn PDF document text
    • https://xufojev.files.wordpress.com/2020/06/misitobi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4C 13744 bytes
SHA-256: ece692f1640f025f1c04d3f06b0cdfe964dc6d1e123f631371e2f1bbf9e6596b

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