Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff41befa42da20ea…

MALICIOUS

PDF

48.5 KB Created: 2020-04-07 11:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15c145b34418cc0ab2c429db80a572c0 SHA-1: fb700ea367a118599fc472ae19ceae2951babcee SHA-256: ff41befa42da20eaecfe53ea49a816ed978a62d40836d367d6b36ac9c1801927
94 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing a large number of external links to other PDF files hosted on various domains. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to these external resources, which could be used for SEO manipulation or to distribute further malware. No scripts were extracted, and the document body content is largely unreadable, making the link farm the most significant indicator of malicious intent.

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://zumarock.org/uploads/1/3/0/4/130435741/130435741.html#proyecto+10+de+espa%C3%B1ol+segundo+grado+de+secundaria
    • http://jordynsattic.com/uploads/1/3/1/4/131437881/rojuzotawupoboza.pdf
    • http://blossombirch.net/uploads/1/3/0/4/130476555/cf7eae0.pdf
    • http://laurenpeterpauldesign.com/uploads/1/3/1/4/131410187/beteteguma.pdf
    • http://gaymexi.co/uploads/1/3/1/4/131406273/jibat-jexefubir-fetimajomovada.pdf
    • http://refindfurnishings.net/uploads/1/3/1/4/131438788/lonulem.pdf
    • http://spiritthatcare.com/uploads/1/3/0/4/130490681/45ed9dd352b.pdf
    • http://yourpublicistknows.com/uploads/1/3/0/5/130550848/nunifowafopofasepako.pdf
    • http://outwardchurchmedia.com/uploads/1/3/0/5/130542865/damavujako.pdf
    • http://ravensroost610.org/uploads/1/3/0/9/130969917/fatadovilibebeza.pdf
    • http://localsidehustle.org/uploads/1/3/1/1/131164364/4041160.pdf
    • http://jdpphotography.org/uploads/1/3/0/3/130323765/d5de82d5.pdf
    • http://furnituristas.com/uploads/1/3/0/5/130539697/b48ed8.pdf
    • http://michaeljamesvocals.com/uploads/1/3/0/9/130969221/nojuket-lubakumopepi-dirakadaxuve.pdf
    • http://sunlakesposse.com/uploads/1/3/0/6/130640133/7e14bf30.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000825d.bin
7b29d9ec0a28b44e6186f351849e299627bb547bd4a4dd89702fe0d71f550269		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825D 9760 bytes
font_01_sfnt_off0000a4bf.bin
66495800c3033db752395888c57a2472d7780c6e20f93c23d8607484346c200d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4BF 4068 bytes

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