Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea56078bfd3ca03…

MALICIOUS

PDF

44.7 KB Created: 2020-03-30 03:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bd927cf9a05361c938a5d5fafbbe6fd8 SHA-1: a08dc1a807f2fc0a8c785b497fbdd6b63de9cf17 SHA-256: 0ea56078bfd3ca033a2971f7067e4d175b1d0c4b75a9c553171eaf7c43d99c81
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a distribution mechanism for further malicious content. The document body, though heavily obfuscated, contains a URL that mirrors the title 'Como hallar el volumen de un rectangulo', indicating a deceptive lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports a high confidence assessment.

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://webdisk.collegedemsatiu.com/uploads/1/3/0/7/130775386/130775386.html#como+hallar+el+volumen+de+un+rectangulo
    • http://elayso.com/uploads/1/3/1/1/131164355/jobevilulikilekubemo.pdf
    • http://mta-sts.mx.suzannejubb.com/uploads/1/3/0/6/130639551/7958094.pdf
    • http://jamonittournaments.org/uploads/1/3/0/7/130775545/jikabazabebep.pdf
    • http://oliviadummer.com/uploads/1/3/1/4/131453555/xaravejurateta-koguf-gejenex-buzojogan.pdf
    • http://bestsolarsales.com/uploads/1/3/0/6/130605405/6546554.pdf
    • http://na5.bon-ha.de/uploads/1/3/1/3/131398424/3976186.pdf
    • http://tennineeightyfour.com/uploads/1/3/0/6/130639710/736083.pdf
    • http://kiridaslittleshop.com/uploads/1/3/0/5/130546486/lurejutibivizemabiki.pdf
    • http://945343297823469420.com/uploads/1/3/0/7/130739253/davumeregek.pdf
    • http://mikejblackwell.com/uploads/1/3/0/5/130588206/8a7af07e5ba.pdf
    • http://nationofsteel.org/uploads/1/3/0/6/130639571/setajigupape.pdf
    • http://ducksnestdecoys.com/uploads/1/3/0/6/130639465/c6297ecb.pdf
    • http://mexusinvestments.com/uploads/1/3/0/7/130738525/f19a7.pdf
    • http://yourcanadaimmigration.com/uploads/1/3/0/7/130740586/8622907.pdf
    • http://9f60bbd905.com/uploads/1/3/0/4/130435594/2328955.pdf
    • http://runningwildinflatable.com/uploads/1/3/0/3/130313673/rinajolol_zovitav_dubebagofonaxo_panasovuzug.pdf
    • http://iglesialanuevacosecha.com/uploads/1/3/0/6/130604716/wamaxep_firigi.pdf
    • http://sportsperformancerevolution.com/uploads/1/3/0/6/130620836/8269852.pdf
    • http://culturally-responsive-communication.com/uploads/1/3/0/5/130546645/bowesopumiruw-pidabojafa.pdf
    • http://patraindiangrill.com/uploads/1/3/1/3/131398009/dukeromurupuje.pdf
    • http://bch-marketing.com/uploads/1/3/0/4/130476372/mixewotuxij.pdf
    • http://ns.wdchamber.com/uploads/1/3/0/7/130738984/xuzorusabatazugiruve.pdf
    • http://mdloanprograms.com/uploads/1/3/0/7/130739393/dd27e0b.pdf
    • http://perfectionautobodyandpaint.com/uploads/1/3/0/6/130620438/277003.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_off00006d07.bin
2eca713a99ba329d4591c49f27b9d9d88d0612239e47439d3d593bedffaad09d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D07 9204 bytes
font_01_sfnt_off00008e3d.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3D 16036 bytes

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