Malicious PDF — malware analysis report

Static analysis result for SHA-256 4849064bac77c2f1…

MALICIOUS

PDF

39.4 KB Created: 2020-03-27 03:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b7b9b4b3728cfe94be9ef008c63c4202 SHA-1: a47726b47bf19d65cc3d5dc8509bbdd1e2ee4846 SHA-256: 4849064bac77c2f14aed9ef2d1b93c5fefefa6c24d5f1ecfcb00d992808040f0
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body mentions 'Rheem rtgh-95dvn manual', which is likely a lure to entice users to click on the embedded malicious URLs. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://churchstrettontaxi.com/uploads/1/3/0/8/130874396/130874396.html#rheem+rtgh-95dvn+manual
    • http://heavenlyhelpinghands.com/uploads/1/3/0/7/130775743/busugaxenojogoxeru.pdf
    • http://unq-gem.com/uploads/1/3/1/0/131070940/2950802.pdf
    • http://www.americanpuppetry.org/uploads/1/3/0/3/130313180/3527968.pdf
    • http://boekrecensiesblog.com/uploads/1/3/0/7/130739978/3249592.pdf
    • http://www.courtassist.com.au/uploads/1/3/0/4/130435906/sovomumemo-femuziwaji-mifob-dikilito.pdf
    • http://sojassyboutique.com/uploads/1/3/0/5/130538836/6726872.pdf
    • http://letuscallforyou.com/uploads/1/3/0/2/130287310/2206982.pdf
    • http://fashionfelicity.com/uploads/1/3/0/9/130969647/duvuruxokokipunipi.pdf
    • http://irielovebuttah.com/uploads/1/3/0/4/130491001/bf8d2c.pdf
    • http://www.piersongardenandlandscape.com/uploads/1/3/0/9/130969699/figaterakinetu.pdf
    • http://www.realdefumados.com.br/uploads/1/3/0/3/130313531/jofajisaganaruzo.pdf
    • http://lefaris.com/uploads/1/3/0/5/130588503/jeduxafokexux_puxibav.pdf
    • http://miacarterbooks.com/uploads/1/3/0/5/130551057/majojutu.pdf
    • http://bestbroadbandsupplier2019.co.uk/uploads/1/3/0/2/130272232/ecc3b0d5fec5ba.pdf
    • http://microfoundations.com/uploads/1/3/0/6/130620423/kusagumisalo_boguvizufo_vimezofo_lugujetaw.pdf
    • http://allaroundtowing209.com/uploads/1/3/0/7/130739258/sekuj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b36.bin
5ea459772722eb1edc1c5fa709cefd23280c3daddf6abd880611e098563b147d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B36 8360 bytes
font_01_sfnt_off00007b59.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B59 16036 bytes

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