Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4f812cfe7dc862…

MALICIOUS

PDF

62.0 KB Created: 2020-04-05 04:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a59f28280b0830d512880ebf9052e2c1 SHA-1: 13c8c31394108fb6e855a45fa8b06a06cc33d6da SHA-256: ac4f812cfe7dc8622cc90f4c0dac7df96c4df8bb66cdca5eaad8070566a79317
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of external links, many of which point to other PDF files on different domains. The heuristic PDF_SEO_LINK_FARM indicates this is a link farm designed to manipulate search engine results. The primary lure appears to be related to 'liquidos penetrantes coloreados pdf'. No scripts were extracted from this sample. The attack pattern is consistent with SEO poisoning to drive traffic to malicious or spam content.

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://premiersiding.net/uploads/1/3/0/4/130436163/130436163.html#liquidos+penetrantes+coloreados+pdf
    • http://dehempify.com/uploads/1/3/0/7/130739887/c3034ff0806d9ac.pdf
    • http://mx.pratahouse.com/uploads/1/3/1/3/131380564/rorom.pdf
    • http://malayalamadeasy.com/uploads/1/3/0/4/130483509/713637210ae9.pdf
    • http://espanola-vbbc.org/uploads/1/3/0/4/130489220/980e36.pdf
    • http://areteseniorconcepts.com/uploads/1/3/0/7/130738769/9792221.pdf
    • http://paths2communication.com/uploads/1/3/0/7/130775806/04e54d39b319e.pdf
    • http://expresswash.net/uploads/1/3/0/4/130489465/dutuzut.pdf
    • http://superiorseamlessroofing.net/uploads/1/3/0/5/130539437/wekudoko.pdf
    • http://angelgabrielfoundation.org/uploads/1/3/0/4/130435635/0cdb180be.pdf
    • http://kitchenelement.com/uploads/1/3/0/5/130540788/tiwusifizetovi-famazij-fexozoposiva-xitewojumuvimef.pdf
    • http://safegaps.solutions/uploads/1/3/0/6/130620159/8488748.pdf
    • http://carterclan.family/uploads/1/3/0/7/130776647/9e762b6fd.pdf
    • https://www.monografias.shtml
    • 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_off0000b1a6.bin
34d75095d8af4551656809020edf79584f732b6c4ab4919cfe76babaa175768f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A6 9404 bytes
font_01_sfnt_off0000d32e.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 16204 bytes

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