Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e6cf68066ac19f…

MALICIOUS

PDF

38.1 KB Created: 2020-03-20 02:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 27bb952bbc8ed4948387dcd8c7f09fe2 SHA-1: 8102343a921dca0bc88f3fc47f25b80a880c3b0b SHA-256: 87e6cf68066ac19f4c8dc9f5161eecd0a0d92ac01fe5cba81fc2368d8474311f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or SEO spam tactic. The document body text, though partially obfuscated, includes the phrase 'Procesos mentales superiores e inferiores' and references 'wkhtmltopdf', suggesting a lure to related content. The ML classifier strongly flagged this PDF as malicious. 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://soundwaveentertainment.org/uploads/1/3/0/6/130639309/130639309.html#procesos+mentales+superiores+e+inferiores
    • http://www.makingmontana.org/uploads/1/3/0/6/130640040/bujemutumoxi_pudipowadujitu_zoruke.pdf
    • http://hostmaster.wayofliving.tv/uploads/1/3/0/8/130874043/9263700b83c532.pdf
    • http://www.alloutracingseries.com/uploads/1/3/0/5/130542920/e98d1.pdf
    • http://www.bybforbes.com/uploads/1/3/0/7/130738679/paviwavoxitiwi.pdf
    • http://ezmoney.us/uploads/1/3/0/5/130538870/fifawijunus-sojafulogogixab-patetubujafuw.pdf
    • http://cycleworkstx.com/uploads/1/3/0/5/130590666/belotabonugijunu.pdf
    • http://vibrationallyyours.com/uploads/1/3/0/2/130274098/9e7804be.pdf
    • http://permaculturefoundationofhawaii.com/uploads/1/3/0/4/130490117/rigezagi-zamogikit.pdf
    • http://tmsmllc.com/uploads/1/3/0/6/130639205/4965574.pdf
    • http://exoticfinding.net/uploads/1/3/0/7/130739793/pewikisobi_lepefidob_diwisupis_dolesovaper.pdf
    • http://hopealivemin.org/uploads/1/3/0/4/130436306/67df03d.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_off00006d13.bin
8a16ac107ab45a3e0871218a223ddaf179790af548ec025ca1ccbd264949bfd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D13 8296 bytes

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