Malicious PDF — malware analysis report

Static analysis result for SHA-256 938157784653f436…

MALICIOUS

PDF

96.5 KB Created: 2020-03-29 05:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d6427cd20f28e6798be9539c8c15940 SHA-1: 6e9149b13a904175ba4accccbf23648e1bc80cee SHA-256: 938157784653f4365da947f1688daad70f3e3c6e4b7138f005b75e16d7178844
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be directing users to a vast network of linked PDFs, likely for SEO manipulation or to serve as a landing page for further malicious activity.

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://host37.carmichaelnl.com/uploads/1/3/0/8/130815017/130815017.html#machiavelli+the+discourses+pdf
    • http://mingateachers.com/uploads/1/3/0/7/130739476/gipezulesoner_lugofuxu.pdf
    • http://pawnshopberlin.com/uploads/1/3/0/5/130588635/zazasegipodena-wabesu-sufaganasirewu.pdf
    • http://sbingman.com/uploads/1/3/0/6/130639664/1146943.pdf
    • http://rmggeotechnicalconsultants.com/uploads/1/3/0/6/130622000/1071744.pdf
    • http://governmentbusinesscouncil.com/uploads/1/3/0/7/130739015/24be920a.pdf
    • http://kenya-help.org/uploads/1/3/0/5/130551013/b5cb26.pdf
    • http://sierrajamesmassage.com/uploads/1/3/0/6/130639973/rurofabob.pdf
    • http://omegastructuresvcllc.org/uploads/1/3/0/7/130738819/4658913.pdf
    • http://umphenourstudio.com/uploads/1/3/0/6/130621071/f125876bb.pdf
    • http://aesco.com/uploads/1/3/0/6/130620578/pajozeradafoduvu.pdf
    • http://firerondackchairs.net/uploads/1/3/0/2/130271076/dajavixowo.pdf
    • http://hostmaster.hazinuk.co.il/uploads/1/3/0/5/130590738/757092.pdf
    • http://www.bridalgownsma.com/uploads/1/3/0/5/130590779/wegoviwogatefidopaxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133db.bin
bdb67a8ea8ee9529dffbd3b54507746002999ff6c3ea14dd729058f90b355736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133DB 8884 bytes
font_01_sfnt_off000155ba.bin
87fd6b1a35a64f5c2d30902eea89631a9c05d6b36ef70c6d0cee4d2ad867525e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155BA 2596 bytes
font_02_sfnt_off00015ed8.bin
252f1159071ecd26b262362b51dd68b3afe90aed6d337d2836c10af61fdacf3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED8 16108 bytes

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