Malicious PDF — malware analysis report

Static analysis result for SHA-256 a005f4bdac8d4869…

MALICIOUS

PDF

41.5 KB Created: 2020-04-02 12:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ea3a4c070c6931404782d39c94093a3e SHA-1: 5bce3b942e334d8afbf9b51f985956f8b1a49c18 SHA-256: a005f4bdac8d48695b2366aea69e58c9242b814a29276e11ab732bfbefc777be
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, contains text related to an exercise bike review and mentions the authoring application, suggesting a lure. The primary attack pattern involves directing users to a network of linked PDF files hosted on unrelated domains, likely for SEO manipulation or to distribute 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://adventuresbyprice.com/uploads/1/3/0/8/130814863/130814863.html#lifecycle+5500+exercise+bike+review
    • http://congresoprorp.com/uploads/1/3/1/3/131384484/8124864.pdf
    • http://findfitnessnj.com/uploads/1/3/1/1/131163920/358427.pdf
    • http://pats-food-shack.com/uploads/1/3/0/5/130588913/3244964.pdf
    • http://hcnnelsonjewelers.com/uploads/1/3/0/2/130270924/xetaw.pdf
    • http://bergermodular.com/uploads/1/3/0/4/130488749/156d9108b803e7.pdf
    • http://teamfarrajgroup.com/uploads/1/3/0/5/130551615/dekitixamexez-wuloxow.pdf
    • http://badasspugclub.com/uploads/1/3/0/2/130270980/3861198.pdf
    • http://platinumpreschool.com/uploads/1/3/0/2/130272286/jexus-tivonimafikowiz.pdf
    • http://trstransporte.com/uploads/1/3/0/7/130739633/6514869.pdf
    • http://hawaii-macadamia-nut.com/uploads/1/3/0/2/130273791/e6378e4e124fe51.pdf
    • http://northernriverspoolsolutions.com/uploads/1/3/0/6/130621969/zuzol.pdf
    • http://unconventional-tech.com/uploads/1/3/0/5/130551536/fozekoxokeri_wufunewuduwar_bureronuboded_xukorikobo.pdf
    • http://djhorton.net/uploads/1/3/0/5/130589297/7254982.pdf
    • http://myoshiashaw.com/uploads/1/3/0/3/130323622/7221605.pdf
    • http://gfkbuilding.org/uploads/1/3/0/7/130738845/budubitebame_nozuwekovir.pdf
    • http://herbalhologram.com/uploads/1/3/0/4/130483565/52e032520a3f0c.pdf
    • http://stichtingpopmuziekthorn.nl/uploads/1/3/0/7/130740456/zetudebazasig.pdf
    • http://nitetoursinternational.com/uploads/1/3/0/5/130588824/dce68584ed.pdf
    • http://theaicollege.com/uploads/1/3/0/5/130589101/4343134.pdf
    • http://latetogreat.org/uploads/1/3/1/0/131069992/a17af543e1af35.pdf
    • http://speakwright.org/uploads/1/3/0/4/130488924/d87a340f714b1b8.pdf
    • http://skicallaghancountry.com/uploads/1/3/0/2/130287457/saxafi.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_off000077b3.bin
f0ce29b1633be75e7461b4ef22e1fd3794529a51f2240cdcc16f7f8f1f8dd301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B3 8576 bytes

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