Malicious PDF — malware analysis report

Static analysis result for SHA-256 347449ffcaa603a9…

MALICIOUS

PDF

47.2 KB Created: 2020-04-02 13:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 22f2fe59abc354f725c94505f14fa7d2 SHA-1: a5bfd9006508018fe846e463d39199fe2a9f5bc2 SHA-256: 347449ffcaa603a9b880b0c41ff745d48c273aaceca8b1cccfe461ac710999b6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO manipulation tactic, often used to distribute malicious content or phish for credentials. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://europlast-okna.pl/uploads/1/3/0/4/130488100/130488100.html#elementos+para+diagnostico+escolar+primaria
    • http://mechapocalypse.net/uploads/1/3/0/8/130874613/9264704.pdf
    • http://casecontroltechnology.com/uploads/1/3/0/6/130621464/f73511.pdf
    • http://bomblikemom.com/uploads/1/3/0/3/130313035/ca31e1b3138b.pdf
    • http://modernmoroni.org/uploads/1/3/0/8/130874300/monisojelikofexo.pdf
    • http://sweethappinessphotography.com/uploads/1/3/0/4/130489522/3f919a7.pdf
    • http://venetianartdesign.com/uploads/1/3/0/5/130590215/13bf0c803.pdf
    • http://fandbtrends.com/uploads/1/3/0/5/130589315/gekelesufe-xozexaxe-jexeg-sevavidosux.pdf
    • http://helotestreeservice.com/uploads/1/3/0/7/130775735/df63f04.pdf
    • http://myplustokenwallet.com/uploads/1/3/0/6/130639121/xetixapotituwukotuju.pdf
    • http://1happybike.com/uploads/1/3/0/7/130776252/vizabevemir_sosur.pdf
    • http://albrightchoir.com/uploads/1/3/0/7/130775116/bamasoti.pdf
    • http://speed-gemmes.com/uploads/1/3/0/6/130604026/poxitizibanukilibufi.pdf
    • http://carolinapumpworks.com/uploads/1/3/0/2/130271217/ruvigak-jezajof-zujiwe.pdf
    • http://jonishuman.com/uploads/1/3/0/7/130739344/c720363cf47ee5e.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_off00008cfd.bin
d7dfeb2203b61b7fc08e72c3b22d8d7fc33ab519bc21fbd59040d5a072d9a268		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFD 9072 bytes

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