Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a901a1aef7d337b…

MALICIOUS

PDF

36.4 KB Created: 2020-03-30 07:39:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b31f663aad2679f07da471c72333d75e SHA-1: 53905237cfb986dd206a737950cdc474e5b314ec SHA-256: 0a901a1aef7d337b296e5095b86b6261eca56d0583eca57badf1c8b403932cfa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. These links likely lead to SEO spam pages or host further malicious content, aiming to redirect the user away from the initial document. The document body itself appears to be corrupted or contains obfuscated text, but the presence of numerous external URLs is the primary 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://adsl-63-204-18-4.benefitplans.org/uploads/1/3/0/8/130814863/130814863.html#ejercicios+peso+y+masa+2+eso+pdf
    • http://biasply.com/uploads/1/3/0/6/130604928/najubepiwatewewojoz.pdf
    • http://mgclothingco.com/uploads/1/3/0/5/130548192/dowezu.pdf
    • http://mysacredself.com/uploads/1/3/0/6/130639380/4808103.pdf
    • http://kwpowerservices.com/uploads/1/3/0/4/130483552/zifikiwulitotuv_faxusew_dijexi.pdf
    • http://brookylnpinchuck.com/uploads/1/3/0/5/130539204/zisumipedomi_kufaw.pdf
    • http://carmendaughertyphotography.com/uploads/1/3/1/4/131409677/214f155.pdf
    • http://primedoutnyc.com/uploads/1/3/0/5/130588487/nebagadu.pdf
    • http://innerpathastrology.com/uploads/1/3/0/6/130639370/xoziwomukefup_midameripegasew_sajefuvisaxapik.pdf
    • http://zrphotography.org/uploads/1/3/0/4/130435524/vitel.pdf
    • http://rustydoobie.ca/uploads/1/3/0/5/130542775/guzubogefozofatiroxe.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052e5.bin
859caf3f06f9ea17e91b725e3320a0b2781b88a9487b810e90f4b1bdc1f13830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52E5 7560 bytes
font_01_sfnt_off00006f61.bin
65ca2fa633a49bc637c245e3469a24bec82cbb291b9200d770c42ee2df1588ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F61 16096 bytes

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