Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc250497bc61e5e…

MALICIOUS

PDF

46.9 KB Created: 2020-03-11 07:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 051d46199796aaf66bb6e82725c99b83 SHA-1: 426f2fca1208d504c584c041c7708387faf65cc5 SHA-256: 8dc250497bc61e5eb5a06452ed94bc792650ab3de85adbe4fb8afa0841b283ab
132 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a structure designed to host numerous links, suggesting a link farm or a distribution point for malicious content. The presence of 'PDF_ACTION_PARSER_EVASION' and a high ML score further support its malicious nature. The document body, though partially corrupted, contains URLs that are likely part of this malicious infrastructure.

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.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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://9f60dnj905.com/uploads/1/3/0/8/130873944/130873944.html#autodesk+fusion+360+install+location
    • http://sofficesolsweas.xyz/uploads/1/3/0/2/130287553/2186364.pdf
    • http://yarilees.com/uploads/1/3/0/7/130776421/sekijatizazigerev.pdf
    • http://maysbornlabradors.co.uk/uploads/1/3/0/6/130621098/ropukotin_roxemunesobugat_lofexe.pdf
    • http://readeveryebook.com/uploads/1/3/0/8/130874130/e23f7933294c9.pdf
    • http://milandmarket.com/uploads/1/3/0/8/130874283/panutiposuzari.pdf
    • http://sportin1.com/uploads/1/3/0/4/130483783/tukijume_tunirax.pdf
    • http://www.amyjlane.com/uploads/1/3/0/5/130551564/784728.pdf
    • http://whitedesignandgrill.com/uploads/1/3/0/4/130476483/2554135.pdf
    • http://www.jazzheartjazz.com/uploads/1/3/0/5/130543466/9494772.pdf
    • http://rnklandscapeservices.com/uploads/1/3/0/8/130873849/temopinunumadaxo.pdf
    • http://mydne.com/uploads/1/3/0/4/130477152/zepoxuweregodevupede.pdf
    • http://getdirtygirl.com/uploads/1/3/0/6/130639624/loxufexisawag.pdf
    • http://mas.agency/uploads/1/3/0/4/130493476/9312872.pdf
    • http://phonesystemswellington.co.nz/uploads/1/3/0/8/130874474/liluvipulopupujo.pdf
    • http://reclaimyourhealth.info/uploads/1/3/0/2/130272579/perozuxofewel.pdf
    • http://madisondigital.net/uploads/1/3/0/3/130379341/8b6fc7ce4cc19.pdf
    • http://www.ec-ac.org/uploads/1/3/0/6/130639091/dowefavidewiv.pdf
    • http://medikka.com/uploads/1/3/0/6/130621917/1467e4e511c24.pdf
    • http://johnmasello.com/uploads/1/3/0/2/130272424/6255201.pdf
    • http://velo-beeler.ch/uploads/1/3/0/6/130603721/dc2bdeb4a0.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_off0000771e.bin
93f783d4fec6524a4c9cfc402506310890285eef2b854e5948f195194dfab3bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771E 8352 bytes
font_01_sfnt_off0000976a.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x976A 16036 bytes

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