Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bdbf36ad2feb99…

MALICIOUS

PDF

50.6 KB Created: 2020-04-11 01:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d0b8885100733a91fd555920ffec5864 SHA-1: 611cfb981aa0ee1bf5d125f7946fbb8cce7703fd SHA-256: 03bdbf36ad2feb992d92836f8017654ed0d9cdf9243c3742da7eb2a4b65adf92
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains a URL that appears to be a lure related to a movie title. The presence of numerous external links and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to potentially harmful content or phishing sites.

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://multistreams.com/uploads/1/3/0/6/130639581/130639581.html#orgullo+y+prejuicio+pelicula+online
    • http://jamieserina.com/uploads/1/3/0/7/130739261/noliwu.pdf
    • http://acdavisbass.com/uploads/1/3/0/5/130588162/7280675.pdf
    • http://natalieannjohnson.net/uploads/1/3/0/8/130814676/0fb265dcc.pdf
    • http://escaperoomprops.info/uploads/1/3/0/5/130540461/8210636.pdf
    • http://lavonnebannisterjackson.com/uploads/1/3/0/5/130551386/47fddcfa8db7.pdf
    • http://foodsempire.com/uploads/1/3/1/0/131070246/0f60f638afc2.pdf
    • http://hereflections.org/uploads/1/3/0/2/130272092/napurumuropo.pdf
    • http://shaleyeah.com/uploads/1/3/0/7/130775199/7516820.pdf
    • http://old-goods.nl/uploads/1/3/0/4/130483751/fonedibo.pdf
    • http://davismadrigals.com/uploads/1/3/0/7/130739755/jixul_sujevebida.pdf
    • http://mouracontabilidadeonline.net/uploads/1/3/0/5/130588721/ginenobufuzud-wemuvugiv-texivaxogivazo-tipaf.pdf
    • http://travelstours.org/uploads/1/3/0/2/130288386/3786531.pdf
    • http://delightpets.net/uploads/1/3/1/0/131070161/5580457.pdf
    • http://roarconference.net/uploads/1/3/0/5/130543488/xuxaxovunob-mitugovukot.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089a0.bin
5278024270de67705d3a5034a26ce2f5e1d9e53f50705cc770b2190155f81e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A0 6728 bytes
font_01_sfnt_off00009a42.bin
02a64c53bad610404019a649f7c12c94ac5fad2fe1ae7facf11ebe8c89c0a8f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A42 9268 bytes

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