Malicious PDF — malware analysis report

Static analysis result for SHA-256 0256d466b375de16…

MALICIOUS

PDF

39.8 KB Created: 2020-03-10 03:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4d7bb31a6cc6d362ca3e5456fce5bf8d SHA-1: 55c27a3b2f0c9d31394198a68a2dbe86b82e3d19 SHA-256: 0256d466b375de16373077b95f9b95c8ca090ede39424f8402a74f05b1dc35d0
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, also contains URLs pointing to external resources. This suggests the primary purpose is to redirect users to potentially malicious websites, possibly for phishing or SEO spam.

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://orders.carolinamikes.com/uploads/1/3/0/7/130739711/130739711.html#adjectives+to+describe+personality+with+n
    • http://www.boisecustomdecks.com/uploads/1/3/0/5/130545189/nixube.pdf
    • http://lunchbox-gourmet.com/uploads/1/3/0/6/130639622/9c11f2b4a529e8b.pdf
    • http://www.knitwhats.com/uploads/1/3/0/6/130605396/9962518.pdf
    • http://weworkdistributed.life/uploads/1/3/0/5/130589285/9118674.pdf
    • http://www.akhnasemi.com/uploads/1/3/0/7/130738837/denitasowadujul-bopupuj.pdf
    • http://getabigbuttformen.com/uploads/1/3/0/2/130289427/051635755ced0.pdf
    • http://www.mao-tdc.com/uploads/1/3/0/3/130379610/tudoxemoli_fonokepuvali_wilabewoborajeg.pdf
    • http://niamaacartistry.info/uploads/1/3/0/7/130774982/5035175.pdf
    • http://www.grumpykittycasa.com/uploads/1/3/0/5/130589320/madofud.pdf
    • http://administrators.margiehauser.com/uploads/1/3/0/3/130324351/powixijoji-dojugekibuxebe.pdf
    • http://greaterplaces.us/uploads/1/3/0/7/130739387/taruleluze-pofubidum-nazesov-fitavumer.pdf
    • http://umutsulun.com/uploads/1/3/0/5/130589006/b20b58a5fc22ca.pdf
    • http://wood-garden.onlinevanstart.nl/uploads/1/3/0/6/130622103/nekelitim-sulowosuvo-kozum.pdf
    • http://www.yaqin.fr/uploads/1/3/0/3/130313188/timutunotubeke-xavozek-xewidupufawu-vamasofoli.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_off0000733d.bin
06585d1fcaa2c8a708b2e3ad3861ccfa31218c618ace1a2e22ec9f203d3adc5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x733D 7932 bytes

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