Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f18250e1287d7f…

MALICIOUS

PDF

35.9 KB Created: 2020-05-17 03:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1627c48cb19e0aa58fbda9b6c4bee013 SHA-1: 1494d4c6749b9fd1d9d17ce0978d0241ae38d700 SHA-256: 87f18250e1287d7ffecc61da6c772dacfd0d60418c5479bfe0001cec0ceb7878
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains a URL that appears to be part of this link farm. The primary purpose seems to be directing users to a network of websites, likely for malicious purposes such as phishing or malware distribution.

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://old-goods.nl/uploads/1/3/0/9/130969634/130969634.html#diabetic+diet+guidelines+in+chinese
    • http://kqmma.com/uploads/1/3/0/7/130740003/jozudadu_vawudilupalurep_laluropuxateki.pdf
    • http://2afreshstart.com/uploads/1/3/1/6/131637104/kokurexezepojasu.pdf
    • http://andersamundson.com/uploads/1/3/0/3/130323220/c3caac7929fa321.pdf
    • http://barefootprincipal.org/uploads/1/3/0/4/130488565/3bfecaf1bd0416.pdf
    • http://whitneyelliott.com/uploads/1/3/0/7/130775551/6410286.pdf
    • http://theclementines.org/uploads/1/3/0/6/130621213/1206005.pdf
    • http://tylarbullion.com/uploads/1/3/1/6/131606505/ridorevejitukedoleg.pdf
    • http://silkroadartsllc.com/uploads/1/3/1/0/131070571/4234877.pdf
    • http://mglobalsolutions.org/uploads/1/3/1/4/131437249/komedasexi.pdf
    • http://3greenhats.com/uploads/1/3/1/4/131453588/godebix-wojexito.pdf
    • http://superconscioustv.com/uploads/1/3/0/5/130539726/8332826.pdf
    • http://journeycommunications.org/uploads/1/3/1/3/131379894/bedafupezumu.pdf
    • http://supersealusa.com/uploads/1/3/0/2/130289535/7173883.pdf
    • http://thesocceridcamp.com/uploads/1/3/1/4/131483020/5b3b4.pdf
    • http://kristenblue.org/uploads/1/3/0/6/130604973/gazosesetewawi.pdf
    • http://policetrailer.com/uploads/1/3/1/8/131856310/f85f395c8c2f4d0.pdf
    • http://mullins-portfolio.com/uploads/1/3/0/9/130969065/8782220.pdf
    • http://windycityartandphotography.ca/uploads/1/3/0/8/130873790/dodorazojivuluzipav.pdf
    • http://rosesforposies.com/uploads/1/3/0/8/130874113/2322091.pdf
    • http://farin-urlaub.net/uploads/1/3/0/6/130604951/4ae367.pdf
    • http://cheggstransportation.com/uploads/1/3/1/8/131856108/xotudij.pdf
    • http://elizabethmackintosh.com/uploads/1/3/0/7/130739369/2d70a0.pdf
    • http://womxnrise.com/uploads/1/3/1/4/131438296/4063155.pdf
    • http://sugarformyhoney.net/uploads/1/3/1/4/131453735/2473813.pdf
    • http://lilacblack.shop/uploads/1/3/0/4/130436224/4024027.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_off0000615c.bin
53df989ff49e9ffb3e07703a8e355357bb64a2b4fedf14b5f778895dcd78def3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615C 9876 bytes

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