Malicious PDF — malware analysis report

Static analysis result for SHA-256 3795922a65b91eac…

MALICIOUS

PDF

56.5 KB Created: 2020-03-25 05:20:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36ac7f2f83e05bec00c7f1b4051078bf SHA-1: dcd9c1e00d65b08690067f99621800cdd389b891 SHA-256: 3795922a65b91eac75579457335fd652c2bdf58cf5e95811a38ae15c1096b59d
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a phishing campaign designed to direct users to potentially malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

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://business-class-store-llc.net/uploads/1/3/0/5/130543757/130543757.html#tecnicas+de+pnl+para+vendas+pdf
    • http://saragracemoments.com/uploads/1/3/0/3/130313360/3964342.pdf
    • http://mochisprite.com/uploads/1/3/0/2/130270917/5a18c1.pdf
    • http://stopandshopshow.com/uploads/1/3/0/3/130313458/3929294.pdf
    • http://claudiatennyson.com/uploads/1/3/0/4/130436159/vubokopo-xadut.pdf
    • http://comphysics.com/uploads/1/3/0/6/130639506/ad1815a39e7.pdf
    • http://selectiveinsurancereviews.com/uploads/1/3/0/7/130775366/foxaseligewerul.pdf
    • http://yorkshirestaffingsolutions.com/uploads/1/3/0/3/130379115/funel_tufopopebajixe_ziradetaveg_mafexivobivetot.pdf
    • http://cdn.artisticvegan.com/uploads/1/3/0/5/130588954/7822470.pdf
    • http://elegant-solutions.org/uploads/1/3/0/7/130739895/ruminag.pdf
    • http://connectingcoffee.com/uploads/1/3/0/4/130483499/592eb75d.pdf
    • http://donnaconlanphysiotherapistleichhardt.com/uploads/1/3/0/7/130775182/17786bc0795c97f.pdf
    • http://www.drandrewlukaris.com/uploads/1/3/0/5/130547150/7100794.pdf
    • http://traditionalworks.ca/uploads/1/3/0/6/130604499/juwol_fosulowebesod_banasamakopukan.pdf
    • http://witchesforest.com/uploads/1/3/0/6/130639411/vuxixudibujelewa.pdf
    • http://amethystambience.com/uploads/1/3/0/6/130620674/8297987.pdf
    • http://libercase.com/uploads/1/3/0/2/130271165/gunolibipuxex.pdf
    • http://hollymonroe.net/uploads/1/3/0/5/130544138/gemipasojebafitamexi.pdf
    • http://hydepark.gd/uploads/1/3/1/1/131164462/5bff32e6ddc40.pdf
    • http://neoericksonian.net/uploads/1/3/0/4/130477126/baxetixemusike.pdf
    • http://summitsalesrecruiting.com/uploads/1/3/0/7/130738885/gugogoxi_teduwifolumo_nixozimebesimik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000092c4.bin
f607065f060f136f4c7204f6185e8cb2120211e468bd344de32d3304a56a8f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92C4 9928 bytes
font_01_sfnt_off0000b3b8.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B8 1708 bytes
font_02_sfnt_off0000bc1f.bin
75ad5726b260fca9c3b66ca94450239fbc156c1891091fcfcfab965e4b2051b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1F 16376 bytes

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