Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3addb22024d7bd…

MALICIOUS

PDF

47.7 KB Created: 2020-03-25 10:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 39c062416b057e0876b0dbf87c9229f7 SHA-1: 4744fd1784f26cb2e74ba94cbed6eee735022e6f SHA-256: 6a3addb22024d7bd48635463d0759f1947102b94e3718a6b14e1096319ba2084
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded URLs are the primary indicators of malicious activity, suggesting a spearphishing attachment used to redirect users to potentially harmful sites.

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://lovelytreats.net/uploads/1/3/0/5/130551219/130551219.html#tipos+de+oraciones+segun+la+actitud+del+hablante+ejemplos
    • http://usafagapc.org/uploads/1/3/0/6/130639859/636df7164677a9c.pdf
    • http://hostmaster.henhouseart.co.uk/uploads/1/3/0/6/130605125/diluvi.pdf
    • http://leggidellamedicina.info/uploads/1/3/0/5/130588656/panumujimod.pdf
    • http://mail.hereiswhereiam.com/uploads/1/3/0/7/130775448/5884880.pdf
    • http://regexecution.net/uploads/1/3/0/4/130483386/rajolejuririzonek.pdf
    • http://thirdgradeladybugs.com/uploads/1/3/0/7/130738619/b1978267360016.pdf
    • http://veloswingfestival.com/uploads/1/3/0/2/130287495/6439774.pdf
    • http://thechurch1689.com/uploads/1/3/0/4/130478360/surativok-nusubaragaxu.pdf
    • http://castlefrancofilms.com/uploads/1/3/0/6/130639424/kibiwiz.pdf
    • http://henrimaddocks.com/uploads/1/3/0/6/130604731/ferubutadujenoj.pdf
    • http://www.clairecalloway.com/uploads/1/3/0/6/130639446/478245.pdf
    • http://webmail.twosunsdoula.com/uploads/1/3/0/6/130639661/puxuxixuwogu-leloju-texasawubobafuz.pdf
    • http://sosthand.com/uploads/1/3/0/2/130291453/3758993.pdf
    • http://mun4all.org/uploads/1/3/0/5/130550666/0a659595d11a4d.pdf
    • http://endyouthrecidivism.com/uploads/1/3/0/3/130324065/bexetuv.pdf
    • http://dailymoneytips.org/uploads/1/3/0/7/130739129/jofiwo-nuvaxirego-jolinizu.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_off00008e73.bin
bd64d81708b83415c04500b2eb8b8a0491e966f3b7f7b3ec44edb97812abd254		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E73 9008 bytes

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