Malicious PDF — malware analysis report

Static analysis result for SHA-256 6855a0d904a18672…

MALICIOUS

PDF

51.9 KB Created: 2020-04-09 07:39:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a6d7e8d32ec28ea7558f5e9698476837 SHA-1: 053d69eb821f9e7c712a58f170a15d68bda22afc SHA-256: 6855a0d904a1867283b365faa2e33746a5d353eae753340c13f1dace11df840c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or content distribution network, likely intended to manipulate search engine results or serve malicious payloads.

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://garrickinternational.com/uploads/1/3/0/2/130288456/130288456.html#que+significa+sociedad+conyugal+vigente
    • http://giddyuppartysupplyrentals.com/uploads/1/3/0/7/130739294/4457c8d378c74b.pdf
    • http://aspenballoonrides.com/uploads/1/3/0/5/130543351/tovupijo.pdf
    • http://sociallauncher.tech/uploads/1/3/0/5/130540814/nisugokuxeka_rapet_bediwupedi_movijed.pdf
    • http://athenamechanicalsupply.com/uploads/1/3/0/7/130739764/2ba772.pdf
    • http://utstkd.com/uploads/1/3/0/5/130544243/puxefixex.pdf
    • http://centrallakessar.com/uploads/1/3/0/6/130639877/rajeko.pdf
    • http://haddadmedicalanddentalcentre.com/uploads/1/3/0/4/130479008/polujugi.pdf
    • http://phillyfloatfactory.com/uploads/1/3/0/5/130541073/25ce3ac5.pdf
    • http://ccbtcc.com/uploads/1/3/0/9/130969429/pafaziganokajugeler.pdf
    • http://thatearchic.com/uploads/1/3/0/8/130814176/179efd.pdf
    • http://mrsdts.com/uploads/1/3/0/6/130604558/5662219.pdf
    • http://krattliministries.org/uploads/1/3/0/8/130873949/dasuj_mexolijaruva.pdf
    • http://heinslpinc.com/uploads/1/3/0/8/130873737/2202271.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_off0000a14b.bin
5fcb429f96219b2887c9c272e829697a2bbe8eab88f4cd0b5ecba8a0005f9cc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA14B 9084 bytes

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