Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7821fedd57d7559…

MALICIOUS

PDF

38.4 KB Created: 2020-03-26 03:10:33 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b7021b5ff46e2dbfce31240c9197ebd9 SHA-1: 25cd780e4328bde340b38f068813607feba8ee8f SHA-256: c7821fedd57d75594d6f04fdb099d4573ca7ebcb949f53cd1a580bdebd581b55
92 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious SEO link farm, containing numerous external links to other PDFs. The document body and extracted URLs suggest a lure for downloading an "English speaking learning app", which is likely a pretext for delivering malware. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://wennbergcontracting.com/uploads/1/3/0/3/130324419/130324419.html#english+speaking+learning+app+free+download
    • http://breakingnewschannel.org/uploads/1/3/0/5/130547275/jifisoziwev-dularipepad-sasuramawawejo-pesotule.pdf
    • http://charlesskeetrodgers.com/uploads/1/3/0/4/130489371/60ab93c4a00bf.pdf
    • http://mail.everopoulou.com/uploads/1/3/1/0/131070072/puxov.pdf
    • http://hillcresthollands.com/uploads/1/3/0/9/130969703/7292859.pdf
    • http://www.wfaeastcoast.org/uploads/1/3/0/3/130313504/ee301e49893bb41.pdf
    • http://prescottyogasummit.com/uploads/1/3/0/8/130814197/f8e5cb91.pdf
    • http://www.findapig.com/uploads/1/3/0/5/130588846/6822051.pdf
    • http://my-iei.com/uploads/1/3/0/7/130775859/1154801.pdf
    • http://plan2succeed.net/uploads/1/3/0/3/130323597/barujum.pdf
    • http://desertendocrine.com/uploads/1/3/0/8/130814788/6425694.pdf
    • http://jennaluna.com/uploads/1/3/0/9/130969871/3343213.pdf
    • http://elisepaisley.com/uploads/1/3/0/6/130620847/2140779.pdf
    • http://nordicswimming.org/uploads/1/3/0/6/130620758/rijuwedegunusa.pdf
    • http://mta-sts.btpbyalison.com/uploads/1/3/0/3/130323220/3a17ec2f38a7.pdf
    • http://mta-sts.ktchorus.org/uploads/1/3/0/7/130775244/69d578b738c4.pdf
    • http://triciapagetherapy.com/uploads/1/3/0/4/130435561/wisarisenodajosez.pdf
    • http://transformationspersonaltraining.com/uploads/1/3/0/4/130490151/b5b3b94d0.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_off00006f85.bin
58b0901fd5b28afee752efd46985bb61f1ae9caeb6703d4dceefd4d37eac147b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F85 7168 bytes

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