Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e28d9ac0c75624…

MALICIOUS

PDF

50.9 KB Created: 2020-03-27 10:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e32ffacc9b1bf7fef3231e7ddc98736e SHA-1: ce540aa575956993283c07bd5626036509039713 SHA-256: 04e28d9ac0c75624bbd3f3f189e112a299467fc508767eca5fa615ace17c33dd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded URLs pointing to external PDF files across numerous domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

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://opssecurityagency.com/uploads/1/3/0/6/130620678/130620678.html#cool+things+to+do+in+summer+with+friends
    • http://meritcardmoapp.com/uploads/1/3/0/6/130604756/1d24edc.pdf
    • http://hostmaster.beratungen-therapien.ch/uploads/1/3/0/3/130379561/2118.pdf
    • http://mcsocialelites.com/uploads/1/3/0/6/130620521/795691.pdf
    • http://www.hubs7.com/uploads/1/3/0/6/130639305/lutasuriwesuduri.pdf
    • http://ctlafrica.org/uploads/1/3/0/7/130740133/0c383.pdf
    • http://server.trainevryday.com/uploads/1/3/0/5/130545097/vimizupidujetedir.pdf
    • http://webmail.ordbrighideach.org/uploads/1/3/0/6/130639468/9357851.pdf
    • http://immobilienmakler-bogenhausen.de/uploads/1/3/0/7/130776718/gewiretole.pdf
    • http://mta-sts.fitzgeraldga.org/uploads/1/3/0/5/130590163/a5d5bdc78916.pdf
    • http://tourguidela.com/uploads/1/3/0/8/130813887/suvaranezibalotil.pdf
    • http://bunkerhilleye.com/uploads/1/3/0/5/130544826/darizidiliwulaw_povobifodoba_bekejuriben_fasoge.pdf
    • http://fortbendpoolcleaning.com/uploads/1/3/0/5/130551073/a07e30265340fc0.pdf
    • http://topdoglifejackets.com/uploads/1/3/0/5/130550938/e35299.pdf
    • http://peterneofotis.com/uploads/1/3/0/5/130551704/661bd8a9e34a.pdf
    • http://franklinrefinishingshop.com/uploads/1/3/0/5/130546717/sitapivinuvuliwevo.pdf
    • http://www.hsc360.com/uploads/1/3/0/4/130476442/fatevopiwozo.pdf
    • http://www.adnpkids-researchfoundation.org/uploads/1/3/0/4/130476541/gixepogiwen.pdf
    • http://redchillisauce.com/uploads/1/3/0/6/130621244/vidigutolope-kizugenoguj-minozowoxoja.pdf
    • http://www.llgchurch.org/uploads/1/3/0/8/130814531/dizorikamov.pdf
    • http://woodmeresupport.com/uploads/1/3/0/6/130620835/e5c2f86c7d54.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_off00009e7e.bin
4d16e9aa62695bfe2f53254e893236e16a16c602cd4f12d62a921b4b43f7fc48
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E7E 8168 bytes