Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b813ad0a386900f…

MALICIOUS

PDF

47.6 KB Created: 2020-03-15 14:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 463b7065d2d82475dc6f6f051300d19a SHA-1: 82ba13d3bc3c1faea0215135e53d85d924e1727c SHA-256: 7b813ad0a386900f025628dbe883b5d2e4600ea1562978e30198df400504b391
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic indicate a likely attempt to deliver a second-stage payload or phish users.

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://host36.carmichaelnl.com/uploads/1/3/0/9/130968931/130968931.html#xef4+reacts+with+sbf5+to+form
    • http://smileproject.ca/uploads/1/3/0/3/130323271/4325452.pdf
    • http://www.seniorenbetreuung24.eu/uploads/1/3/0/6/130620695/3601515.pdf
    • http://haloesmixers.com/uploads/1/3/0/2/130274267/zonokerilibix-tojojamivad.pdf
    • http://farmhousets.net/uploads/1/3/0/5/130539131/xosagititepamududuko.pdf
    • http://www.isaesthetically.com/uploads/1/3/0/2/130272396/6f62ef.pdf
    • http://friendsandwellness.com/uploads/1/3/0/2/130291416/kopow_govijubomifoku.pdf
    • http://hostmaster.improvenutrition.co.uk/uploads/1/3/0/5/130551651/4219017.pdf
    • http://www.woodvaleflorist.com/uploads/1/3/0/6/130605368/teboronedopifexoriwo.pdf
    • http://thesupporthelp247.com/uploads/1/3/0/2/130270777/lelamoma.pdf
    • http://michellewhyman.com/uploads/1/3/0/6/130639876/pinisozapimek-divir-lerilamesezi-vepebofukazutaw.pdf
    • http://beorganizedbefree.com/uploads/1/3/0/4/130476390/512444.pdf
    • http://www.southernlushgifts.com/uploads/1/3/0/6/130604885/divazetas-pokinav.pdf
    • http://propx.net/uploads/1/3/0/7/130775507/316800.pdf
    • http://peterbartleet.com/uploads/1/3/0/7/130739260/mevumabojojolu-gisezoviv.pdf
    • http://stormikc.net/uploads/1/3/0/6/130620564/tiravokofawizip.pdf
    • http://tintanegrahtx.com/uploads/1/3/0/6/130604250/bikipijenokoti.pdf
    • http://ncmjamaica.com/uploads/1/3/0/3/130379135/9183159.pdf
    • http://weblifefinancial.com/uploads/1/3/0/5/130551253/lededoporil_tesemidaj_gurabe.pdf
    • http://healthcannabis.com/uploads/1/3/0/5/130539325/6388067.pdf
    • http://lotuspureskin.com/uploads/1/3/0/6/130621641/9809183.pdf
    • http://s4k.speech4kidz.com/uploads/1/3/0/5/130589312/witokowa.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f2c.bin
4b8072f833785850daa4f6cecbb9023e25125bee985e8b2d89737b3de892d6c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2C 8880 bytes

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