Malicious PDF — malware analysis report

Static analysis result for SHA-256 d521c56bd9938417…

MALICIOUS

PDF

33.6 KB Created: 2020-03-10 04:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2026-05-08
MD5: 4c7dc1d2b1cbf24a901430fa517814e2 SHA-1: fd6c69d2cafe14a83fb9ee4b5915f0de59adce1a SHA-256: d521c56bd99384175387dc2d341501c3f094186ab6fb3d7c623614dfd3b34715
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to 'recombinant dna technology introduction ppt' and appears to be generated by wkhtmltopdf. The primary attack pattern involves directing users to a vast network of linked websites, likely for SEO spam or to host further malicious content. No scripts were extracted from this sample.

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://life.mediutopia.com/uploads/1/3/0/7/130775974/130775974.html#recombinant+dna+technology+introduction+ppt PDF link annotation
    • http://impacttechventures.com/uploads/1/3/0/7/130776245/9410418.pdfIn PDF document text
    • http://thegrosses.net/uploads/1/3/0/6/130604741/ditowa.pdfIn PDF document text
    • http://www.keepitrealfam.com/uploads/1/3/0/5/130545189/2670890.pdfIn PDF document text
    • http://www.lookingatplants.com/uploads/1/3/0/7/130775145/faa836b94d1dda.pdfIn PDF document text
    • http://www.jollyjackssocialclubllc.com/uploads/1/3/0/2/130270785/423b6f5dc4.pdfIn PDF document text
    • http://investinrentalproperty.com/uploads/1/3/0/7/130775929/6909701.pdfIn PDF document text
    • http://lpcoalition.com/uploads/1/3/0/2/130289719/321351.pdfIn PDF document text
    • http://woodhavenfinancial.com/uploads/1/3/0/4/130489230/7854091.pdfIn PDF document text
    • http://californiaconnecting.org/uploads/1/3/0/7/130776676/1153204.pdfIn PDF document text
    • http://stuartleadershipplatform.com/uploads/1/3/0/6/130621076/7aa7ddb.pdfIn PDF document text
    • http://mistershaky.com/uploads/1/3/0/5/130550742/mutanafan.pdfIn PDF document text
    • http://crispandcrunch.com/uploads/1/3/0/3/130313294/dazebanujo_binebewelaloj_zodepuwevu_luzedajarilolad.pdfIn PDF document text
    • http://cleahbunting.com/uploads/1/3/0/4/130489102/ropitowagejirasufaja.pdfIn PDF document text
    • http://escaperoomfairfax.com/uploads/1/3/0/4/130490719/garidolesuv_gevugixubus.pdfIn PDF document text
    • http://drivingfordyslexia.com/uploads/1/3/0/3/130324357/bibeze_rowenufugu.pdfIn PDF document text
    • http://licfonline.com/uploads/1/3/0/5/130550724/wafetetexotugid.pdfIn PDF document text
    • http://restorationchurchag.org/uploads/1/3/0/6/130620451/jekiforog.pdfIn PDF document text
    • http://andystats.org/uploads/1/3/0/2/130289224/giwizopajodolabij.pdfIn PDF document text
    • http://mylistingexpired.net/uploads/1/3/0/6/130639321/xikuvoxub.pdfIn PDF document text
    • http://www.mouthandmuscle.net/uploads/1/3/0/3/130313196/juxonunowavo.pdfIn PDF document text
    • http://hydrovida.com/uploads/1/3/0/8/130874091/totile-ruzipibek-sirokojura-bewilepin.pdfIn PDF document text
    • http://scougall.com/uploads/1/3/0/6/130621740/kobogozinirukol.pdfIn PDF document text
    • http://avselect.ca/uploads/1/3/0/6/130603979/gamebup_fumaxupexid_sekapukopifirut_dogibazulob.pdfIn PDF document text
    • http://montclairradiology.net/uploads/1/3/0/6/130604104/lebovorox.pdfIn PDF document text
    • http://columbushardscapes.com/uploads/1/3/0/2/130270863/feten_zetanolotop_dakow_tabegop.pdfIn 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

Related samples 4

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6120 5712 bytes
SHA-256: 83b2b81acc7922563d2046dca04a4c6a52add10cd5d14ae88bd113cefdff1a4e

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