Malicious PDF — malware analysis report

Static analysis result for SHA-256 4927667545d66fdd…

MALICIOUS

PDF

44.0 KB Created: 2020-03-22 08:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1562ddbc4ea732c55e6cbfb67ae4b892 SHA-1: 226053d69986c39bb70ff4b248429fc404ef7268 SHA-256: 4927667545d66fdd58badcaf1db493b4f27190fdd1edf99f87a31047d3810ffd
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the title 'Que es correcto planificar o planear' and references wkhtmltopdf, suggesting a generated document. The primary attack pattern appears to be a link farm designed to drive traffic or distribute further payloads via the numerous embedded URLs.

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://skinspiritlife.com/uploads/1/3/0/7/130739015/130739015.html#que+es+correcto+planificar+o+planear
    • http://pivkofilm.com/uploads/1/3/0/6/130604402/lepixit.pdf
    • http://camillaprice.com/uploads/1/3/0/8/130814508/vizexizamo_timowap_tagatesiru_pemoro.pdf
    • http://laligadelagua.com/uploads/1/3/0/5/130588943/137d3.pdf
    • http://12250parkway.com/uploads/1/3/0/3/130323290/72c778f2889.pdf
    • http://vegancannabis.com/uploads/1/3/0/6/130621472/63e9d.pdf
    • http://rktttherapy.com/uploads/1/3/0/3/130313557/1402c67ba.pdf
    • http://iatw.net/uploads/1/3/0/5/130589218/kakakek.pdf
    • http://www.rosytribe.com/uploads/1/3/0/7/130775023/netuve-botifina-sovog-wudawuwepivo.pdf
    • http://axleblog.fallstreakstudio.com/uploads/1/3/0/6/130620431/jefekufubemel-jasujokijivi.pdf
    • http://pressurewashingtorrance.com/uploads/1/3/0/7/130740461/sereporu.pdf
    • http://pushnpull.fitness/uploads/1/3/0/6/130605168/nopipa-rizug-nimufij.pdf
    • http://journeylaurel.net/uploads/1/3/0/7/130776790/loxopajujejil.pdf
    • http://mail.e7gos.com/uploads/1/3/0/6/130621701/zelojunawej.pdf
    • http://charleshoustonfoundation.org/uploads/1/3/0/9/130969764/govaferunorewirus.pdf
    • http://www.stephenfordham.com/uploads/1/3/0/6/130639656/xowezawabasawepad.pdf
    • http://kayleighpeddie.com/uploads/1/3/0/2/130289611/kisatodan.pdf
    • http://brodiefosterhubbard.com/uploads/1/3/0/4/130483266/xigesubuwivelag.pdf
    • http://boutiquedimitrycosty.eu/uploads/1/3/1/0/131071289/2463033.pdf
    • http://nwlaxshack.com/uploads/1/3/0/2/130272853/zifakoke-jijonon-nujefe.pdf
    • http://worldmacro.com/uploads/1/3/0/3/130313541/lanuxos_jakagukoxapod_nakunojidamebow_baxipipokal.pdf
    • http://preview.theepicremedy.com/uploads/1/3/0/8/130874119/1912934.pdf
    • http://simplecleaningsolution.net/uploads/1/3/0/5/130538841/a256d00b21a6.pdf
    • http://www.thewashingtoncondo.com/uploads/1/3/0/8/130873830/07250e59114bdd.pdf
    • http://stickemupcustomdecals.com/uploads/1/3/0/4/130483614/ruxijufonewifo_fofanisefag_denas.pdf
    • http://www.tuttelut1.com/uploads/1/3/0/6/130620619/2322153.pdf
    • http://www.thewashingtoncondo.com/uploads/1/3/0/8/130873830/07250e59114bdd
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008210.bin
6e9037c8de9d75f03b653c54b670d974a9a3b94bff28459144ad92701788cb2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8210 8808 bytes

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