Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64c4e3fb97e4a6e…

MALICIOUS

PDF

33.5 KB Created: 2020-04-10 05:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ee77cf28119342e9306838132bd7fcf7 SHA-1: 81509c3770f0b813885d1c9f9bc097bace3f95fc SHA-256: b64c4e3fb97e4a6e9849225d95a816235482acc5e21f03d02e9b0a53455850e9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicative of an SEO poisoning or link farm attack. The ML classifier strongly flagged this PDF as malicious. The document body contains references to 'Dell optiplex 755 user manual pdf' and 'wkhtmltopdf', suggesting a lure to disguise the malicious nature of the links.

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://newtownusa.net/uploads/1/3/0/8/130873998/130873998.html#dell+optiplex+755+user+manual+pdf
    • http://jarrodcoxplc.com/uploads/1/3/0/5/130590339/8068796.pdf
    • http://rojoboutique.com/uploads/1/3/0/4/130483670/varusidejuzeduw.pdf
    • http://wholehealingbodyworks.com/uploads/1/3/0/2/130287847/betedazisarusi.pdf
    • http://amazinghousecleaning.com/uploads/1/3/0/5/130589348/wakuboleginarax.pdf
    • http://thenetworkclub.net/uploads/1/3/1/0/131070904/2924783.pdf
    • http://purenergyhealing.com/uploads/1/3/0/5/130551143/5438525.pdf
    • http://ezercizzinazzarenu.com/uploads/1/3/1/3/131379685/vuxib.pdf
    • http://coffeeshopincome.com/uploads/1/3/0/9/130969728/sotevijebuwilo.pdf
    • http://premiertravelerus.com/uploads/1/3/1/1/131164174/famebujo_fadoxejid_rajiwoji.pdf
    • http://slineandbeauty.com/uploads/1/3/0/2/130287835/5f81d1a2ebbe8.pdf
    • http://neighborhoodlighthouse.org/uploads/1/3/0/6/130620172/vilakajegibal_wijesaxituke_litozusoseg_vekufi.pdf
    • http://reversac-traductions.com/uploads/1/3/0/6/130621470/338f93e9a041e.pdf
    • http://swfloridaframingservices.com/uploads/1/3/0/3/130312937/5677344.pdf
    • http://theauthentichuman.co/uploads/1/3/0/5/130543289/2e11d330e2503bc.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_off00005a03.bin
da5594311d8768c0876e2b75f5f3313b2d43094fbab7c053bee7a5e62691d7a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A03 8020 bytes

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