Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6e91e02f51b075…

MALICIOUS

PDF

41.2 KB Created: 2020-03-30 14:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4c3af119f269f7e8466e3e86e251b26 SHA-1: 8f7ceeca5cea3f79017feecc205527f4c04878e1 SHA-256: da6e91e02f51b0757973e097601f880efa47a5bd7a05bc1423b5539d3397a3b6
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique commonly used for SEO poisoning or traffic redirection. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are part of this link farm. No scripts were extracted from this sample.

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://greenwolfverticalfarm.com/uploads/1/3/1/4/131438448/131438448.html#taotao+electric+scooter+charger
    • http://muzoesmeraldas.com/uploads/1/3/0/6/130620750/sotopiso_luvisiradib_visuf_jadudag.pdf
    • http://cookhomesky.com/uploads/1/3/0/4/130488063/f2cdb938e043005.pdf
    • http://rvcleaning.org/uploads/1/3/0/8/130814859/840dbb19.pdf
    • http://eutonievereniging.info/uploads/1/3/0/4/130488780/zivisivufisodo.pdf
    • http://globalfinancialwealth.com/uploads/1/3/0/7/130739333/vuvunijilut_mademu_pegosuzib_zazekewi.pdf
    • http://doctoranature.com/uploads/1/3/0/6/130603772/6703657.pdf
    • http://gallerysiestakey.com/uploads/1/3/0/5/130550895/ranivesu-bugibotewivu.pdf
    • http://mllefastoche.com/uploads/1/3/1/4/131410662/biliraxezisoz-ronozomufoxud-mofinunigerov.pdf
    • http://addylou.net/uploads/1/3/0/7/130739291/budukabir_bosijoxudo_bogafow_pepedigonama.pdf
    • http://shannonsresaleonline.com/uploads/1/3/0/6/130621206/zemodonivama.pdf
    • http://relentlesssoulutions.com/uploads/1/3/0/6/130620709/rebazi.pdf
    • http://apevictorhugo.com/uploads/1/3/0/6/130621435/2c416.pdf
    • http://goodmansinteriors.com/uploads/1/3/0/6/130621915/9165025.pdf
    • http://greenzonefx.com/uploads/1/3/0/6/130605351/piwunenamajal_moroda_senelus_tapafivu.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_off000074d3.bin
90f09914456fc5a3929dfefbd4100df7606205ec14c73c43582a610a2b30287c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D3 8832 bytes

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