Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4b3e0a2d5ae245…

MALICIOUS

PDF

40.8 KB Created: 2020-03-22 11:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 29e6c8f675379703b0ed19feebf18bad SHA-1: d6462d595c7645e181b76c8304dbb731e71fe418 SHA-256: 8f4b3e0a2d5ae245fd2f7fcf03e1b90c357362b923500f0a7828e596faead934
96 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 as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially corrupted, contains text related to 'Vocales y consonantes ejercicios pdf' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure for educational content. The primary attack pattern involves redirecting users to a network of linked websites, likely for SEO manipulation or to host further malicious content.

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://wolfecityhomecoming.com/uploads/1/3/0/6/130604085/130604085.html#vocales+y+consonantes+ejercicios+pdf
    • http://www.islandcool.org/uploads/1/3/0/3/130313056/nupugazipurimul.pdf
    • http://annamariecrowhurst.com/uploads/1/3/0/4/130483959/bubuxit-boxifenaze.pdf
    • http://themartchicago.com/uploads/1/3/0/7/130775518/6717927.pdf
    • http://chicanarose.com/uploads/1/3/0/7/130775619/8780894.pdf
    • http://stemresourceshawaii.org/uploads/1/3/0/4/130488213/wameg.pdf
    • http://imagecathedral.net/uploads/1/3/0/6/130604757/taretutiwotagun-bubebugoloju.pdf
    • http://www.activefrenchbuldogspups.org/uploads/1/3/0/6/130604250/faval_badovuwitilizeb_zawubigo_xebavi.pdf
    • http://taysangels.com/uploads/1/3/0/5/130588269/5235982.pdf
    • http://www.caminandoconcristo.dadgifts.us/uploads/1/3/0/2/130291507/c5a1fc.pdf
    • http://poulsborvspecials.com/uploads/1/3/0/2/130289244/wixibupumotonema.pdf
    • http://xintaiyangchengkaihuyouhui.br3h.com/uploads/1/3/0/4/130436236/9267498.pdf
    • http://nietojewelry.com/uploads/1/3/0/5/130539934/16d76daf.pdf
    • http://mail.teresapietsch.com/uploads/1/3/0/8/130874544/69936.pdf
    • http://www.ssunitedstatesreef.com/uploads/1/3/0/2/130272353/a7c9c6f.pdf
    • http://sar-casm.com/uploads/1/3/0/7/130740097/puludapixuvunobo.pdf
    • http://deannalindstrom.com/uploads/1/3/0/7/130775106/6523645.pdf
    • http://goetscheria.com/uploads/1/3/0/7/130775011/nivimenuvigobir.pdf
    • http://mylydian.com/uploads/1/3/0/6/130639231/dedag.pdf
    • http://www.littleleopardcats.com/uploads/1/3/0/4/130435777/xufepojew.pdf
    • http://bathwildcitywalks.co.uk/uploads/1/3/0/6/130604411/4683657.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_off000073db.bin
39574b88e350160fcf03a40d602a2ee3b8c6a0dfe7766ce59bd128b14a49193b
pdf-font-stream PDF embedded font (sfnt) at offset 0x73DB 8824 bytes