Malicious PDF — malware analysis report

Static analysis result for SHA-256 79226558843fb7f9…

MALICIOUS

PDF

63.1 KB Created: 2020-06-08 03:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47bd29ad3c7876efe51f1980ab86bcb8 SHA-1: 928b28ed8f59e9b85cb84346504e50d505a8d230 SHA-256: 79226558843fb7f9af600086024109ba897dc1fbec9293f2ee8256c4bb4c705b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links to external websites, a technique often used to host malicious content or conduct phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a coordinated effort to distribute content or redirect users. While no scripts were directly extracted, the presence of embedded URIs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://sugarmommascookieco.com/uploads/1/3/1/0/131070258/131070258.html#exercicios+sobre+os+povos+pr%25C3%25A9+colombianos+com+gabarito
    • http://74-123-78-108.mgwnet.com/uploads/1/3/1/4/131406744/9967171.pdf
    • http://carnitasmine.com/uploads/1/3/0/9/130969885/feluxenamara_tisemusa.pdf
    • http://heatwaveheadwear.com/uploads/1/3/0/6/130604449/98cf256b8fb292c.pdf
    • http://discountdivanetwork.com/uploads/1/3/0/8/130815124/6a284.pdf
    • http://hopesilverado.com/uploads/1/3/0/3/130313253/romujo.pdf
    • http://hoptransport.com/uploads/1/3/0/8/130873822/9943767.pdf
    • http://autodiscover.griffinschiller.com/uploads/1/3/0/6/130639343/d0b6116954.pdf
    • http://vakantiehuishappiness.nl/uploads/1/3/0/3/130313306/soner.pdf
    • http://staging6.tnhempfarmacy.com/uploads/1/3/0/7/130775536/togejavumameviminux.pdf
    • http://dantothofficial.com/uploads/1/3/1/1/131164007/2068523.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://wuxewaxijij.files.wordpress.com/2020/06/70929213195.pdf
    • https://pobiwupisega.files.wordpress.com/2020/06/61666503268.pdf
    • https://ligarupature.files.wordpress.com/2020/06/67638385448.pdf
    • https://nelozupo.files.wordpress.com/2020/06/38676649693.pdf
    • https://nemopopa.files.wordpress.com/2020/06/wosuzipagelagixofipimak.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c67c.bin
1bf575f0bdeb3a6559fa83855250706d1f8fbb30e702cd5f9a9e9d0a224d3dca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC67C 13856 bytes

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