Malicious PDF — malware analysis report

Static analysis result for SHA-256 106a36e688063d42…

MALICIOUS

PDF

37.8 KB Created: 2020-06-03 15:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faf7dff752788d8453ffa800b793a168 SHA-1: ba0486e5db61e32a9fe963e9c64e77db69be99ed SHA-256: 106a36e688063d42b49954735c45ca4fc597467a995448eae650c3a08222409c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains associated with SEO link farms. The ML classifier also flagged this PDF as malicious. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted from this sample.

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://montanapurewood.com/uploads/1/3/0/8/130874666/130874666.html#lenovo+yoga+2+11+20332
    • http://thejonellaqueen.com/uploads/1/3/0/6/130639785/vozilep-tosufigufemeker-fiwidexegol-tibibovojoses.pdf
    • http://strigiformae.org/uploads/1/3/0/4/130478663/a55b955f.pdf
    • http://zankion9.com/uploads/1/3/0/6/130621903/6681837.pdf
    • http://sunrayllc.com/uploads/1/3/0/2/130288383/xugivoriv.pdf
    • http://lifesteward.org/uploads/1/3/1/4/131438313/477782.pdf
    • http://node.tarbro.com/uploads/1/3/1/8/131856068/bixuferidepe.pdf
    • http://montanapurewood.com/uploads/1/3/0/8/130874666/terms.html
    • http://montanapurewood.com/uploads/1/3/0/8/130874666/dmca.html
    • http://montanapurewood.com/uploads/1/3/0/8/130874666/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tezozila.files.wordpress.com/2020/06/wasanirebomalonobufojewaz.pdf
    • https://wiwabewata.files.wordpress.com/2020/05/97943406912.pdf
    • https://lorimanugolu303520256.files.wordpress.com/2020/05/9028478100.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e08.bin
111c509ff1e15112d00ba5f4eef41bac5c8b3235d675ba1c5915fbfb6695eeed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E08 14292 bytes

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