Malicious PDF — malware analysis report

Static analysis result for SHA-256 630d09c1242a66e5…

MALICIOUS

PDF

29.8 KB Created: 2020-05-16 18:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bea85edcd93c1deb5f60dd777d48042 SHA-1: d74ebd876f059595851711d1fa11b2b40c9217bf SHA-256: 630d09c1242a66e5934e1c3d4e70862770092b0ec0a7b8297a82667f3235a1bf
96 Risk Score

Malware Insights

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

The PDF document masquerades as a weather report but contains a large number of embedded external links, indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links to other PDF files suggests a multi-stage attack or a method to distribute malicious content across various domains.

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://columbusbalance.com/uploads/1/3/0/6/130639613/130639613.html#cambridge+md+weather+report
    • http://to-nooss.com/uploads/1/3/0/5/130588763/6115833.pdf
    • http://dreamdamselart.com/uploads/1/3/0/6/130605357/88c610.pdf
    • http://xmascreationsbynj.com/uploads/1/3/0/5/130539696/jixivoxofogele-wifixadoz-jowuze-worupo.pdf
    • http://eringjohnson.com/uploads/1/3/1/3/131398174/wubekofem-vanorip-gapeliku.pdf
    • http://staycoolslime.com/uploads/1/3/0/4/130488969/vedalefix.pdf
    • http://crmi-online.com/uploads/1/3/1/3/131381411/robipujonojen_vujelajovofurex.pdf
    • http://jackson-blue.com/uploads/1/3/0/6/130620657/9237189.pdf
    • http://aceremodelingmn.com/uploads/1/3/0/5/130590521/7944904.pdf
    • http://vegandsm.com/uploads/1/3/0/4/130436033/9433038.pdf
    • http://gsquarecommunications.com/uploads/1/3/0/7/130775876/9356213.pdf
    • http://bearpawsbernedoodles.org/uploads/1/3/1/0/131069744/2538744.pdf
    • http://clearthefactory.com/uploads/1/3/0/4/130488223/jitizofalo-noladefosuz-judogifo.pdf
    • http://ogfwolfeboro.com/uploads/1/3/0/3/130313000/049a35920dc4.pdf
    • http://solandgroup.com/uploads/1/3/0/4/130483645/1884819.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_off00004c46.bin
3fa3fd8033078d07d088ce45dafabe9b1213a8a3907fdb1867c37ea75b7f6efc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C46 9264 bytes

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