Malicious PDF — malware analysis report

Static analysis result for SHA-256 d753d9c8d8dbbdf8…

MALICIOUS

PDF

42.0 KB Created: 2020-04-13 09:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d70e24fff0f90822bc1ac61f3f359be5 SHA-1: f35730f1071c4ba491864582d7a56f579595ca02 SHA-256: d753d9c8d8dbbdf870c794ed6e9344f6566dbd6ab1de6354a893fde8de698ec4
94 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body, though heavily obfuscated, contains the text "What is big data ingestion" and references the wkhtmltopdf tool, suggesting a content-generation or SEO spamming purpose. The primary attack pattern involves luring users to a network of linked websites.

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://humannaturefoundation.com/uploads/1/3/0/7/130739786/130739786.html#what+is+big+data+ingestion
    • http://stpaulschurchfulda.org/uploads/1/3/0/3/130323219/299f319.pdf
    • http://michaeltigue.com/uploads/1/3/0/6/130604093/sabuzit_zajimab.pdf
    • http://goldencodservices.com/uploads/1/3/1/3/131384024/tabokuv.pdf
    • http://jacservices.net/uploads/1/3/0/5/130539357/puvududanak.pdf
    • http://ascendiaparagliding.com/uploads/1/3/0/3/130312913/tijerijusanafeso.pdf
    • http://costamedicalmarijuana.com/uploads/1/3/0/8/130813079/2265957.pdf
    • http://conventuslending.com/uploads/1/3/0/6/130639136/6784683.pdf
    • http://waxisd2019techaudit.info/uploads/1/3/0/7/130776423/8130499.pdf
    • http://freecryptocurrency.club/uploads/1/3/0/6/130639551/mejoriku.pdf
    • http://akeetonbooks.com/uploads/1/3/0/6/130639178/c625296.pdf
    • http://musicvibes.info/uploads/1/3/1/3/131398278/sijozij.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_off00007c08.bin
e1f344798e1def27f95e6ad19c4a64cfb0f3256eac18bcf49149c5f03fd3a592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C08 8340 bytes

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