Malicious PDF — malware analysis report

Static analysis result for SHA-256 813914638091f5d5…

MALICIOUS

PDF

32.5 KB Created: 2020-04-16 16:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d05d5c35834ab6bf6e3f05da085db142 SHA-1: 17bc5e4e533bf38daff01fe1dfbb39e371086dcd SHA-256: 813914638091f5d582e7789aaab27df7e07a44588f9ea031bf943d858ead3f62
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm. The primary purpose appears to be SEO manipulation or redirecting users to potentially malicious content hosted on various domains. The ML classifier strongly indicated maliciousness, supporting this assessment.

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://unique-security-solutions.com/uploads/1/3/0/8/130873822/130873822.html#full+wave+rectification+lab+report
    • http://cheerlifeusa.com/uploads/1/3/0/7/130775126/fizinofe_fugogipajo_foporubowugite_bunaxinamozepe.pdf
    • http://bottabiscotti.com/uploads/1/3/0/8/130874511/65e797663444.pdf
    • http://amescyclecenter.com/uploads/1/3/0/5/130542872/45c0786d6ab6a.pdf
    • http://ciaoitalianz.com/uploads/1/3/0/5/130550828/8681726.pdf
    • http://dixievetclinic.com/uploads/1/3/0/6/130620594/818611.pdf
    • http://jrhomeservicesllc.net/uploads/1/3/0/6/130603825/3ce23605e.pdf
    • http://raenanrazinesh.com/uploads/1/3/0/4/130435544/zetijuxunu_vuvuzesut_ramepifit_kubujurit.pdf
    • http://aishinnu.com/uploads/1/3/0/4/130476628/lekurizaniwebulun.pdf
    • http://michaelsheehanwriter.com/uploads/1/3/0/6/130620758/646199.pdf
    • http://netivos.org/uploads/1/3/0/6/130640236/9267e.pdf
    • http://ilovemondayseducation.com/uploads/1/3/0/2/130289354/107e48.pdf
    • http://thresholdlife.com/uploads/1/3/0/6/130621997/5e861df.pdf
    • http://cashmytruck.com/uploads/1/3/0/6/130603982/62eeeb47a01ea9.pdf
    • http://mta-sts.vetgyd.lt/uploads/1/3/1/3/131378774/5780c73c997a.pdf
    • http://michaelsheehanwriter.com/uploads
    • 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_off0000575e.bin
9540f95df0f96ecb0987a5a3ce1662c2cbf1de2aa07b638d770e84fcb9f172e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x575E 7312 bytes

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