Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f459186fbe2e8d…

MALICIOUS

PDF

34.8 KB Created: 2020-05-13 13:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 86512855a17d0789ec3a3a12bd3a2fd7 SHA-1: 8257424830a12eefc50b56b8a470c83d16c6cbfb SHA-256: 65f459186fbe2e8d63c3d32a228a9979ecd4f17d63deb447ffec6a7fcbb43c22
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a spam or SEO manipulation purpose. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature. No scripts were extracted, but the extensive linking pattern is indicative of a malicious campaign.

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://porcus-sanus.de/uploads/1/3/1/4/131453321/131453321.html#vmware+esxi+6.+5++vmdk
    • http://travelschoreit.net/uploads/1/3/0/9/130969804/vanos-popowokapew-sosijogutife.pdf
    • http://jerroydmoore.com/uploads/1/3/1/4/131482958/65224c062.pdf
    • http://urbanmintbtq.com/uploads/1/3/0/5/130539992/lodufavamoromul.pdf
    • http://paulvanwanrooij.nl/uploads/1/3/0/7/130775635/pajukuted_ranifib_rugubepa.pdf
    • http://mlshomeinspections.net/uploads/1/3/0/7/130776824/4073882.pdf
    • http://2brosconstruction.com/uploads/1/3/0/7/130740027/bevasamola.pdf
    • http://pixldoc.com/uploads/1/3/0/6/130604473/xezazegimubixek.pdf
    • http://ranchonuevoiaebi.com/uploads/1/3/0/4/130489536/sojigobuvifu-gunemo-xebewagugivase.pdf
    • http://ilenerichardsonmedia.com/uploads/1/3/0/7/130775321/4460564.pdf
    • http://promotionconsultores.com/uploads/1/3/0/5/130551777/3638959.pdf
    • http://marylandmissionalchurch.com/uploads/1/3/1/4/131455475/a6940.pdf
    • http://samuellock.org/uploads/1/3/0/9/130969461/3253444.pdf
    • http://certa.xyz/uploads/1/3/1/3/131384675/mifudijes-tubuvaxawow-xapix-dujejevudiva.pdf
    • http://univclean.com/uploads/1/3/0/5/130590710/74979169.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_off00005b53.bin
452db94d9dc0767fa127d9333d891e20ead1347d3c02b9f50a7e19f92b262e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B53 10892 bytes

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