Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8713a6670260bb…

MALICIOUS

PDF

51.0 KB Created: 2020-05-19 12:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: b70a59f7b191f01e7d1e77a3f55a7b92 SHA-1: 8f1cfec70e88d2ec0fdeacdfc139dedf3f29e6d1 SHA-256: 3b8713a6670260bb685104c5f55508a680371d2024348999f63c38245de58164
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, many pointing to other PDF files. The PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content. The embedded URLs and the structure suggest a campaign to redirect users to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://secure-pof.com/uploads/1/3/0/4/130436140/130436140.html#coffee+chinese+chess+0.5 PDF link annotation
    • http://betuniekweddings.com/uploads/1/3/0/5/130539366/3783606.pdfIn PDF document text
    • http://ehanakennels.com/uploads/1/3/0/4/130488584/fimerokogonemesiz.pdfIn PDF document text
    • http://plot-360.com/uploads/1/3/1/3/131382740/74532087d.pdfIn PDF document text
    • http://jewishschoolchoice.org/uploads/1/3/0/4/130476678/rikerunarin_roponotibido_tabitime_viriwobemeno.pdfIn PDF document text
    • http://thecreamreport.com/uploads/1/3/0/9/130969824/vebakudo.pdfIn PDF document text
    • http://elizabethstone.net/uploads/1/3/0/4/130476183/8123217.pdfIn PDF document text
    • http://blacktreelofts.com/uploads/1/3/0/5/130550895/nikew_wunijere_najudulefugojul_nubukudako.pdfIn PDF document text
    • http://victoriousu.com/uploads/1/3/1/6/131606089/4454510.pdfIn PDF document text
    • http://alyssagarberwrites.com/uploads/1/3/0/7/130775191/wewuzitiwef.pdfIn PDF document text
    • http://hawaiibachataexpo.com/uploads/1/3/0/9/130969218/45e3c4.pdfIn PDF document text
    • http://mrncleaningservicescom.com/uploads/1/3/0/7/130739139/mefivino.pdfIn PDF document text
    • http://tygrellc.com/uploads/1/3/0/3/130324370/volibisumip.pdfIn PDF document text
    • http://portsmouthboilerrepair.com/uploads/1/3/0/7/130739121/wukulodi.pdfIn PDF document text
    • http://sugarcraftcreations.net/uploads/1/3/0/2/130272981/7735381.pdfIn PDF document text
    • http://youniquebysherrygibson.com/uploads/1/3/0/6/130605430/1133466.pdfIn PDF document text
    • http://kdcakes.net/uploads/1/3/0/6/130604466/vagupivufidomejepan.pdfIn PDF document text
    • http://landofmisfittoyandcomics.com/uploads/1/3/0/4/130488513/fisubim-kojugibeguz-xarerudirez.pdfIn PDF document text
    • http://southwestgardenandsnow.com/uploads/1/3/0/3/130379336/8780099.pdfIn PDF document text
    • http://inverwrap.com/uploads/1/3/1/4/131453416/4524148.pdfIn PDF document text
    • http://cydeco.org/uploads/1/3/0/2/130291545/mevobogikem_dofixapenu_sodakuxirisev.pdfIn PDF document text
    • http://cprheartlife.com/uploads/1/3/0/4/130483614/mubolaxadibir.pdfIn PDF document text
    • http://maryseatoninteriors.com/uploads/1/3/1/3/131397950/ximaxanupubolejalof.pdfIn PDF document text
    • http://thetickproject.com/uploads/1/3/1/0/131071021/xobepigepawotiwu.pdfIn PDF document text
    • http://professorsjrichards.com/uploads/1/3/0/2/130271184/bimutu.pdfIn PDF document text
    • http://sur-realle.com/uploads/1/3/0/7/130776734/d2d8f9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000869f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869F 5316 bytes
SHA-256: e8b3ccee735ddafde8de0da84c4c22c2890ed71c951208342c700a465681f0d0
font_01_sfnt_off000098aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98AA 11784 bytes
SHA-256: 037102ac5c6b29fb2e0d63faa20559d83e47fff3e3ead7985063dd94406d90cb

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