Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36aa7f104339d10…

MALICIOUS

PDF

40.4 KB Created: 2020-03-30 08:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cdce5fed9c450bd21a3d3e368cc872ad SHA-1: 6ffb37e1cf2726c4acac10cf038101d4139945ae SHA-256: b36aa7f104339d10b3afe9fe034977ba6e131bd57785e7816a7e65eb57aa4385
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains a reference to a quiz and includes the same URLs found in the heuristics, suggesting a lure to engage the user. The primary function appears to be distributing a large number of linked PDF files from various domains.

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://lennoxweb.com/uploads/1/3/0/6/130639362/130639362.html#first+twenty+elements+quiz
    • http://volry0-dvto99.com/uploads/1/3/0/5/130550920/5092963.pdf
    • http://sensorvalley.org/uploads/1/3/0/8/130874535/f0651eb4fde42.pdf
    • http://enrtwinz.online/uploads/1/3/0/5/130589275/fed960b.pdf
    • http://snowmedics.com/uploads/1/3/0/6/130621665/zulalupunib.pdf
    • http://kblawncaresolutions.com/uploads/1/3/0/6/130605492/kezivokobanek.pdf
    • http://stucadoorsbedrijf-utrecht.nl/uploads/1/3/0/6/130620957/5689232.pdf
    • http://bb-bongos.com/uploads/1/3/0/6/130621740/8622345.pdf
    • http://evervinedesigns.com/uploads/1/3/0/8/130874676/guxajemexaf.pdf
    • http://kollaborateglobal.com/uploads/1/3/0/7/130739723/tafufuzituxapiwiveda.pdf
    • http://pshovel.com/uploads/1/3/0/5/130551880/galadunag.pdf
    • http://tomtopal.com/uploads/1/3/1/3/131383678/vidinuxa_sodozupix_deberex.pdf
    • http://southernpersnickety.com/uploads/1/3/0/6/130604716/tofafire.pdf
    • http://willispropertycompany.com/uploads/1/3/0/5/130539247/2859136.pdf
    • http://specialdental.net/uploads/1/3/0/7/130776143/wigiliwenatoz-toxim-namegedunogari-wegexuw.pdf
    • http://gardencritteracademy.com/uploads/1/3/0/8/130814921/c57784a5.pdf
    • http://canaryfilms.org/uploads/1/3/0/3/130323224/tekunazipowus.pdf
    • http://mycannablissonline.com/uploads/1/3/0/7/130740612/d6a16051d8a6c3.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_off000073c4.bin
ea6e1110f965bcf3d880da4f4b67028dfbddbcebf52dfd5ea0edc400c7489ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C4 8452 bytes

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