Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb50af0a2c8b3ac…

MALICIOUS

PDF

40.6 KB Created: 2020-05-19 08:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab804fc9e0226480004ab0bf937384fa SHA-1: d66435b8f6998fd11ba33f5ce8281af9599038d7 SHA-256: 0fb50af0a2c8b3acd93d2009948718adc631ab894b7723086a10cf71acda11d5
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 a distribution mechanism for further malicious content, potentially leading to a phishing or malware download site.

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://nohaygasaqui.org/uploads/1/3/0/5/130589275/130589275.html#ejercicios+de+distribucion+normal
    • http://plasticityproductions.com/uploads/1/3/0/4/130483187/1109265.pdf
    • http://pump-culture.com/uploads/1/3/0/6/130605452/nokatixewaloxo.pdf
    • http://azincubators.org/uploads/1/3/0/2/130291544/nefojizobi.pdf
    • http://wonderoaks.org/uploads/1/3/1/3/131378975/lobinozemulo.pdf
    • http://logisticsolutioninc.com/uploads/1/3/0/4/130483216/milumene_vugawog.pdf
    • http://islanderwool.com/uploads/1/3/1/3/131398452/mepaniwosufomof.pdf
    • http://1169certified.us/uploads/1/3/0/4/130478244/danuji-gexezimomajok-rojadozofaleb.pdf
    • http://splarsonconstruction.com/uploads/1/3/0/7/130775472/werepewi.pdf
    • http://mspritchett.com/uploads/1/3/0/8/130874157/1947772.pdf
    • http://transalanticsociety.com/uploads/1/3/0/2/130272496/biwojimimofaxu.pdf
    • http://kristen-stone-the-writer.com/uploads/1/3/0/7/130776079/totaguwomodobijijela.pdf
    • http://dogargroup.net/uploads/1/3/1/3/131379356/rebeg.pdf
    • http://lymanband.com/uploads/1/3/0/7/130776275/lituzapemumo.pdf
    • http://zerogravityuas.com/uploads/1/3/0/4/130493476/67358b8f10b1a.pdf
    • http://milledgevillepd.org/uploads/1/3/0/9/130969016/kijod_xaludofazak_gosiximamexi_wefudigaz.pdf
    • http://cambridgeacademicpress.org/uploads/1/3/0/2/130289733/8841f325d0669bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00006ff2.bin
f5e31cf1b8c794967e47aa3a3276a59d83c8345d2347489ef9f730e4d68bfc57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF2 12276 bytes

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