Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c9ea853caef793…

MALICIOUS

PDF

46.6 KB Created: 2020-04-02 03:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38b315b2a56dfe596c6d360115f5de45 SHA-1: 2140461a3617e07fadcaa563a7eb3468cabe5788 SHA-256: 52c9ea853caef793eafd8e24fb5758a82900cb5b2f987f55c2d581968d4248dc
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to PDF files. The document body, though heavily obfuscated, contains text suggesting a tutorial lure. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a link farm of potentially malicious or phishing sites.

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://northernessentialtack.com/uploads/1/3/0/8/130814735/130814735.html#ms+excel+tutorial+video+in+hindi
    • http://4dvast.com/uploads/1/3/0/8/130874088/ximepe-xuxog.pdf
    • http://onvegetablesalone.com/uploads/1/3/0/5/130544954/f33100f76f2e.pdf
    • http://jandmbatavia.com/uploads/1/3/0/6/130621089/sitamajisek-fikezama-ladijotak.pdf
    • http://mercedjetcenter.com/uploads/1/3/0/2/130289265/950063.pdf
    • http://tailor-wear.com/uploads/1/3/0/3/130323936/8564089.pdf
    • http://bikecycleshop.com/uploads/1/3/0/9/130969186/9a787d5e1497c9a.pdf
    • http://icsetssh.com/uploads/1/3/0/7/130740173/faririmofak.pdf
    • http://orcphanage.com/uploads/1/3/0/8/130814681/35168.pdf
    • http://kgboutiquedesigns.com/uploads/1/3/0/7/130740419/noxabufux.pdf
    • http://specialedaugusta.org/uploads/1/3/0/5/130550910/5167835.pdf
    • http://colehearingservices.com/uploads/1/3/1/0/131071278/bipipugopagisiri.pdf
    • http://filfoodtogo.com/uploads/1/3/1/1/131164564/ralepifuvuf.pdf
    • http://pursegallery.com/uploads/1/3/1/3/131379381/6168020.pdf
    • http://vancouverholidayrental.com/uploads/1/3/0/2/130289779/2873289.pdf
    • http://mediamilitia.org/uploads/1/3/0/6/130604022/4341170.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_off00008d3a.bin
2f7d860e8f83f115dfc893fe40610bb6e44dbb408f5ea51470003627d1684c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3A 8268 bytes

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