Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a23d2866ce38b4…

MALICIOUS

PDF

37.7 KB Created: 2020-03-11 13:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2021-05-23
MD5: 1abfe2e38d91e3ef69dac5a4a9c530d1 SHA-1: 7edd193418c1364c613c434be55e1e88013c6cb6 SHA-256: c7a23d2866ce38b46e3fe93ca8784042f31858cc6d54a2645303275a83c8ecee
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The embedded document body text, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list. This suggests the document's primary purpose is to redirect users to a network of external sites, potentially for SEO spam or to host further malicious content.

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://boxinyulechengdaili.br3h.com/uploads/1/3/0/5/130539837/130539837.html#markov+chain+text+generator+algorithm PDF link annotation
    • http://atriumx.com/uploads/1/3/0/8/130874039/kixixojenivitinexas.pdfIn PDF document text
    • http://livinglightcenter.net/uploads/1/3/0/7/130775845/182e2bc1587f6f.pdfIn PDF document text
    • http://www.sweethearttreebridal.com/uploads/1/3/0/9/130969432/811ee0d1.pdfIn PDF document text
    • http://74-123-77-163.mgwnet.com/uploads/1/3/0/3/130323116/filuxez-mesageba.pdfIn PDF document text
    • http://corefirecommando.com/uploads/1/3/0/7/130738741/jimena.pdfIn PDF document text
    • http://wileybrands.com/uploads/1/3/0/7/130776405/boloxumu.pdfIn PDF document text
    • http://theoret.ca/uploads/1/3/0/6/130620949/vukeweb.pdfIn PDF document text
    • http://rebeccaword.com/uploads/1/3/0/8/130813509/7145437.pdfIn PDF document text
    • http://doggiestylezllc.com/uploads/1/3/0/6/130639720/bibijarom_letevenomikulo_jutideg.pdfIn PDF document text
    • http://docklifemelbournefl.com/uploads/1/3/0/3/130323520/gugexusimozig.pdfIn PDF document text
    • http://nadlanonline.net/uploads/1/3/0/3/130313539/xakepafopinusixi.pdfIn PDF document text
    • http://cerecintraoral.com/uploads/1/3/0/5/130588203/20bde86.pdfIn PDF document text
    • http://hanglooseweb.com/uploads/1/3/0/4/130488993/divalukapugewotep.pdfIn PDF document text
    • http://arkham-studios.com/uploads/1/3/0/6/130640091/57b92dd44caec.pdfIn PDF document text
    • http://www.yorkshirecamperhire.com/uploads/1/3/0/3/130324030/jijobebanejogobenuj.pdfIn PDF document text
    • http://smartpromoting.com/uploads/1/3/0/6/130604821/b009baeac2e.pdfIn PDF document text
    • http://www.thedogdish.ca/uploads/1/3/0/2/130291649/4651975.pdfIn PDF document text
    • http://www.amitopup.com/uploads/1/3/0/7/130739069/980366.pdfIn PDF document text
    • http://mechcomp2016.caece.net/uploads/1/3/0/5/130590139/zitopiku_lukep_bitofa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA4 7784 bytes
SHA-256: 5836be1435f8cf2203af622859d548b1fd9bc60ce675aca5ca7ba1a478122493

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