Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae00992d1f53d7a7…

MALICIOUS

PDF

42.3 KB Created: 2020-03-14 20:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2314345e00372c11630cbf939df9fc20 SHA-1: 22607757011f17d188174aed84fd6581dee59ee9 SHA-256: ae00992d1f53d7a7da6dabda612173b901bcd001a30c1aba30cc3802381d4075
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files on various domains, suggesting a link farm or SEO poisoning tactic. The primary external URI points to an HTML file with a "reading worksheets high school" theme, which is likely a lure. The ML classifier strongly indicated maliciousness. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

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://msgarletts-hancock.com/uploads/1/3/0/4/130488578/130488578.html#reading+worksheets+high+school
    • http://sacredheartsrising.ca/uploads/1/3/0/7/130739062/3217166.pdf
    • http://catalinagardeazabal.com/uploads/1/3/0/5/130550756/getodewugodetid.pdf
    • http://naturallynubian.com/uploads/1/3/0/5/130540725/zujesadej.pdf
    • http://heartbeatboxingclub.com/uploads/1/3/0/4/130491932/bukujidada.pdf
    • http://villessentialantigua.com/uploads/1/3/0/6/130621357/9a80912710.pdf
    • http://www.cavespringband.com/uploads/1/3/0/5/130590678/likokuv_rikotajikakasez.pdf
    • http://localfrio.net/uploads/1/3/0/2/130287938/4f7beb.pdf
    • http://btl168.com/uploads/1/3/0/5/130540104/tatoxavaxedov_nijajilezafati.pdf
    • http://hazelcoboutique.com/uploads/1/3/0/9/130969458/bewisimatug.pdf
    • http://mijnheerdegroot.nl/uploads/1/3/0/7/130740060/9f1ebd7be.pdf
    • http://bethmorton.com/uploads/1/3/0/5/130551231/6984387.pdf
    • http://battnetwork.com/uploads/1/3/0/7/130738913/gipeji.pdf
    • http://raoulartprojects.com/uploads/1/3/0/6/130621583/fdb681c07bfb00.pdf
    • http://albertasounddesign.com/uploads/1/3/0/5/130590666/ruwokux.pdf
    • http://deluxedesignbuild.net/uploads/1/3/0/6/130605292/f76946704903705.pdf
    • http://nhcapcadets.org/uploads/1/3/0/3/130379426/razot-fiximegidekapek.pdf
    • http://www.gindystires.com/uploads/1/3/0/2/130289335/1752956.pdf
    • http://kbcornholegames.com/uploads/1/3/0/7/130776279/e2ca21.pdf
    • http://hello-baby-toys.com/uploads/1/3/0/6/130639675/3710604.pdf
    • http://www.illuminatishipped.com/uploads/1/3/0/7/130740066/wejub_jukoruzubore.pdf
    • http://sharonrosegabet.com/uploads/1/3/0/7/130776041/9426072.pdf
    • http://garagedoorrepairlomita-ca.com/uploads/1/3/0/5/130543569/2013824.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_off00007c5e.bin
d7dcbd191ebef05357b2dde8b433ff68bdcbdaed58915b5db99be9bfb4f54c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5E 8076 bytes

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