Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab9d41276596b0f…

MALICIOUS

PDF

60.1 KB Created: 2020-04-06 14:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cf1425e45a6b593d9e02cb34c76b7ca4 SHA-1: 53b766e2b2d1454ee3e60105604a55aa089450c1 SHA-256: 8ab9d41276596b0f79be54e5eb7061f407544ff0552daf3620d07e8037a27e91
94 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, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a mechanism to distribute malicious content. The ML classifier also 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://ecgcore.com/uploads/1/3/0/5/130590550/130590550.html#iliad+of+homer+book+1+summary
    • http://hortodimensao.com/uploads/1/3/1/3/131398134/2256ea0.pdf
    • http://rosieriggir.com/uploads/1/3/1/3/131380612/bibubifiruzatokovafu.pdf
    • http://mareike.coach/uploads/1/3/0/5/130551219/rigufomisitafa.pdf
    • http://kyaninutritionforlife.com/uploads/1/3/0/3/130323488/ae0f6.pdf
    • http://divinebeautylondon.com/uploads/1/3/0/8/130874051/5637171.pdf
    • http://resumereveal.com/uploads/1/3/0/4/130478935/gikerirepuronepap.pdf
    • http://sandradee.org/uploads/1/3/0/6/130621215/835d4f3d09c203.pdf
    • http://yourlondoninventory.com/uploads/1/3/0/3/130313553/timabumut_sopasev.pdf
    • http://kiddywinkskindy.org/uploads/1/3/0/7/130775174/foviwosejenu.pdf
    • http://propertyinvestmentworld.org/uploads/1/3/0/5/130589223/sugatak.pdf
    • http://meticules.com/uploads/1/3/0/6/130621755/lijopajulixun.pdf
    • http://highlandscountrystore.com/uploads/1/3/0/5/130550912/ragigetidojuge-xozow.pdf
    • http://fhcdsenroll.com/uploads/1/3/0/2/130272369/sazobiwubel-novowolatefeta-novelu-ridufunutakogas.pdf
    • http://cooperatestore.com/uploads/1/3/0/2/130288887/rewavutoputog.pdf
    • http://barefootcottageswellsbeach.com/uploads/1/3/0/4/130489830/41614.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_off0000c70d.bin
759103895e874052be119d1c8de45cfd9a931df81ef053f3263ed54aeabc4af6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 7144 bytes

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