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) First seen: 2020-09-24
MD5: 051d46199796aaf66bb6e82725c99b83 SHA-1: 426f2fca1208d504c584c041c7708387faf65cc5 SHA-256: 8dc250497bc61e5eb5a06452ed94bc792650ab3de85adbe4fb8afa0841b283ab
96 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.
  • 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://9f60dnj905.com/uploads/1/3/0/8/130873944/130873944.html#autodesk+fusion+360+install+location PDF link annotation
    • http://sofficesolsweas.xyz/uploads/1/3/0/2/130287553/2186364.pdfIn PDF document text
    • http://yarilees.com/uploads/1/3/0/7/130776421/sekijatizazigerev.pdfIn PDF document text
    • http://maysbornlabradors.co.uk/uploads/1/3/0/6/130621098/ropukotin_roxemunesobugat_lofexe.pdfIn PDF document text
    • http://readeveryebook.com/uploads/1/3/0/8/130874130/e23f7933294c9.pdfIn PDF document text
    • http://milandmarket.com/uploads/1/3/0/8/130874283/panutiposuzari.pdfIn PDF document text
    • http://sportin1.com/uploads/1/3/0/4/130483783/tukijume_tunirax.pdfIn PDF document text
    • http://www.amyjlane.com/uploads/1/3/0/5/130551564/784728.pdfIn PDF document text
    • http://whitedesignandgrill.com/uploads/1/3/0/4/130476483/2554135.pdfIn PDF document text
    • http://www.jazzheartjazz.com/uploads/1/3/0/5/130543466/9494772.pdfIn PDF document text
    • http://rnklandscapeservices.com/uploads/1/3/0/8/130873849/temopinunumadaxo.pdfIn PDF document text
    • http://mydne.com/uploads/1/3/0/4/130477152/zepoxuweregodevupede.pdfIn PDF document text
    • http://getdirtygirl.com/uploads/1/3/0/6/130639624/loxufexisawag.pdfIn PDF document text
    • http://mas.agency/uploads/1/3/0/4/130493476/9312872.pdfIn PDF document text
    • http://phonesystemswellington.co.nz/uploads/1/3/0/8/130874474/liluvipulopupujo.pdfIn PDF document text
    • http://reclaimyourhealth.info/uploads/1/3/0/2/130272579/perozuxofewel.pdfIn PDF document text
    • http://madisondigital.net/uploads/1/3/0/3/130379341/8b6fc7ce4cc19.pdfIn PDF document text
    • http://www.ec-ac.org/uploads/1/3/0/6/130639091/dowefavidewiv.pdfIn PDF document text
    • http://medikka.com/uploads/1/3/0/6/130621917/1467e4e511c24.pdfIn PDF document text
    • http://johnmasello.com/uploads/1/3/0/2/130272424/6255201.pdfIn PDF document text
    • http://velo-beeler.ch/uploads/1/3/0/6/130603721/dc2bdeb4a0.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000771e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x771E 8352 bytes
SHA-256: 93f783d4fec6524a4c9cfc402506310890285eef2b854e5948f195194dfab3bd
font_01_sfnt_off0000976a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x976A 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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