Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c9f66bd4957d02…

MALICIOUS

PDF

79.6 KB Created: 2020-05-15 05:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3a33d014f95abf62d23942a7e6e9d63 SHA-1: 10e42e4d41f03699cd25085b268dd50eff7e0a5a SHA-256: 51c9f66bd4957d02a79c70e350016515eb4e70b2221be0aeb95ff283bf7b75ba
94 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, characteristic of a link farm. The primary purpose appears to be directing users to numerous external PDF files hosted on various domains, potentially for SEO manipulation or to serve as a distribution point for further malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://youcandrawit.com/uploads/1/3/0/4/130476514/130476514.html#chloroform+molecular+structure
    • http://laurajanematthews.com/uploads/1/3/0/7/130739099/mokiz.pdf
    • http://pareguide.com/uploads/1/3/0/2/130287456/4ad53b.pdf
    • http://naturalwellnessacupuncture.com/uploads/1/3/1/6/131637306/lidoraxuga-terefen-kenuxozul-xusimileg.pdf
    • http://mycheckride.com/uploads/1/3/0/8/130874647/jodisi.pdf
    • http://ollienellieboutique.com/uploads/1/3/0/9/130969362/nanikesokotilo.pdf
    • http://kinderkleiderflohmish.com/uploads/1/3/0/6/130603740/d06bfc91cf.pdf
    • http://nataliesoulardcalligraphy.com/uploads/1/3/0/7/130776656/50359.pdf
    • http://hudsonriverrats.org/uploads/1/3/1/4/131483020/bemajukufafu.pdf
    • http://marshallsheatingcoolingllc.com/uploads/1/3/0/6/130603824/zudilesunafa.pdf
    • http://thewillinglistener.com/uploads/1/3/0/5/130539204/gadezoluget.pdf
    • http://cascadeladyhoops.com/uploads/1/3/0/6/130604487/26c20c6aad0847d.pdf
    • http://sohoflorals.com/uploads/1/3/1/4/131407665/sinukupadigefa.pdf
    • http://thaiontheisland.com/uploads/1/3/1/0/131071021/4a682d.pdf
    • http://essentiallyideas.com/uploads/1/3/1/4/131408572/f5b1e30a2636a22.pdf
    • http://kicksmasteronline.com/uploads/1/3/0/6/130603704/kawujuvinake.pdf
    • http://authenticbreakthrough.org/uploads/1/3/0/6/130603745/5e2ad737.pdf
    • http://turnpikedc.com/uploads/1/3/0/7/130740429/3ab2d86.pdf
    • http://001radio.com/uploads/1/3/1/4/131453682/belurijen.pdf
    • http://daisychainprelovedclothing.com/uploads/1/3/0/9/130969062/78567.pdf
    • http://mihomeambassador.com/uploads/1/3/1/4/131410299/1789936.pdf
    • http://foodiefest.us/uploads/1/3/0/6/130621788/4715706.pdf
    • http://crockettlawyers.com/uploads/1/3/0/6/130620757/degopukoredax.pdf
    • http://riverboundfarm.com/uploads/1/3/0/2/130289480/mokuloja.pdf
    • http://bonnenuitsleepconsulting.com/uploads/1/3/0/6/130604102/8d0ea1d1ae5e.pdf
    • http://legrandmichael.com/uploads/1/3/0/8/130873995/kujezivez_nutorap.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f646.bin
e372b72275a5be51254aef29237819e264f8666627f7fcebc053501b44a96939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 6492 bytes
font_01_sfnt_off00010675.bin
86b2e85cc5bdbcb478d6d175b557a28353f85aca9b0fbd68a87acfdcc18acd02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 13316 bytes

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