Malicious PDF — malware analysis report

Static analysis result for SHA-256 1100432b190d5cdc…

MALICIOUS

PDF

46.7 KB Created: 2020-03-29 11:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a486b0023d997ee8fa5fac4c797bfd57 SHA-1: 886dbf2fbe8ce0f2edef2e47058fd739b5302880 SHA-256: 1100432b190d5cdcc0e64987103a3b690a60fb03fbcd3eb435dbd9b40c7a2598
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains URLs that are also listed in the extracted URLs, suggesting a coordinated effort to link to numerous external PDF files. This pattern is often used for SEO spam or to distribute malware.

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://74-123-76-23.mgwnet.com/uploads/1/3/0/7/130775604/130775604.html#proving+triangles+congruent+reference+worksheet+answers
    • http://beyondlightbeats.com/uploads/1/3/1/1/131163723/gasigowa.pdf
    • http://globalvisionoptometry.info/uploads/1/3/0/6/130604757/2781864.pdf
    • http://vietavia.com/uploads/1/3/0/7/130739347/jinixepivizov.pdf
    • http://cutestgirlintheworld.org/uploads/1/3/0/8/130873853/jabebakomimolatogo.pdf
    • http://douglasrealtor.com/uploads/1/3/0/7/130775590/8773165.pdf
    • http://carlamaebailey.com/uploads/1/3/0/2/130291572/luwibugolunizopun.pdf
    • http://empirelane.net/uploads/1/3/0/5/130539706/xogejexaderad_tupagazadago_wewunadevekope_bitavevogu.pdf
    • http://www.xmo1.com/uploads/1/3/0/4/130436147/nulilexaturipodelile.pdf
    • http://matthesmusic.org/uploads/1/3/0/5/130551125/5694903.pdf
    • http://moneyscript.co/uploads/1/3/1/0/131070298/tujediselagalal-napuk-dakewikosinibaz-xazilamabo.pdf
    • http://lynnewrightvirtualpa.com/uploads/1/3/0/8/130813511/6905722.pdf
    • http://rent2ownshop.com/uploads/1/3/0/4/130488773/1257331bfac7bb.pdf
    • http://compradorpessoal.com/uploads/1/3/0/6/130620998/1312217.pdf
    • http://rippleeffect.shop/uploads/1/3/0/4/130483565/gefuvuxoxaxube.pdf
    • http://allimaccomputers.com/uploads/1/3/0/5/130546432/piluv_woxajora.pdf
    • http://thedebbies.org/uploads/1/3/1/3/131383751/woviduj.pdf
    • http://akizusushi.com/uploads/1/3/0/8/130813818/sibitifex_xeluxuropufa.pdf
    • http://tambuaeventsbookingagency.com/uploads/1/3/0/6/130605422/8d29a4a22f2f23.pdf
    • http://queenslandcapital.com/uploads/1/3/0/6/130639254/vakugibejaxalej_pimenamaguvexu_wulet_barap.pdf
    • http://donoharmskincare.com/uploads/1/3/0/2/130287890/696072.pdf
    • http://fulton201.com/uploads/1/3/0/5/130539355/08a191b5cc4.pdf
    • http://latvijasrepublika.info/uploads/1/3/0/7/130739625/kobipamadun_zepokiwut_tetajarejesigew_gikararivares.pdf
    • http://sedona-verdevalley.net/uploads/1/3/0/2/130271085/zupevusumujotutuket.pdf
    • http://buttehomes4sale.com/uploads/1/3/0/3/130323143/juvig-nifigepu-xajurafevibani.pdf
    • http://systemsuitabilityanalytics.com/uploads/1/3/0/5/130551857/xurunijip_loloxalizan.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076e5.bin
a1947d65cd9c8105cc6c726faa6143a281165eef374d3051465cf61fa012d3dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E5 8392 bytes
font_01_sfnt_off00009738.bin
eb3eb75404dce3ff5138856fdb64036719bdd557a5f8c062583c2614eddde746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9738 16072 bytes

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