Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cdcd3589b39f1e…

MALICIOUS

PDF

39.0 KB Created: 2020-03-16 05:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8ab82ccb5ccba88c40d0ac29b4a36baa SHA-1: c3306baace24573efd3a8c8aa7ede65dbcab7512 SHA-256: 15cdcd3589b39f1e244c60fcfdf6e5db6822ca4738475c79b20209b537103192
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links to other PDF files hosted across various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is likely an attempt to manipulate search engine results or distribute a large volume of content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact payload or intent beyond link distribution.

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://francescocamuglia.com/uploads/1/3/0/6/130620321/130620321.html#handwriting+practice+worksheet+creator
    • http://www.madewithheart.org/uploads/1/3/0/2/130289773/41bdf210f0312.pdf
    • http://www.myisom.net/uploads/1/3/0/6/130604649/988f46150016b.pdf
    • http://princeofbarkness.com/uploads/1/3/0/6/130604452/4440093.pdf
    • http://mybluejeansbookkeeping.com/uploads/1/3/0/8/130813975/9783374.pdf
    • http://littlepandaicecream.com/uploads/1/3/0/2/130289754/3484163.pdf
    • http://lithabarivermining.com/uploads/1/3/0/7/130775961/saxiwok.pdf
    • http://dedicatedladiesconcrete.com/uploads/1/3/0/5/130551949/roxijo_diwuse.pdf
    • http://loren-brown.com/uploads/1/3/0/5/130551576/99834fe3c.pdf
    • http://listenupmedia.net/uploads/1/3/0/2/130288757/diranidugefas_bavozonuvavebo.pdf
    • http://mmjbookkeeper.com/uploads/1/3/0/4/130488469/belemarigemawikelole.pdf
    • http://naukajazdywroclaw.com.pl/uploads/1/3/0/6/130639635/sepidipirenunotin.pdf
    • http://leggidellamedicina.info/uploads/1/3/0/5/130544413/bc8640.pdf
    • http://www.zeetadollhouse.com/uploads/1/3/0/4/130476101/jajikerovogig.pdf
    • http://qatarfireengineering.com/uploads/1/3/0/6/130639593/58992530.pdf
    • http://frugal.group/uploads/1/3/0/4/130488820/5b3a3eee4ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006546.bin
ef619c17fe974f7b5c371952e2122eb89df095d060d54ea08a94589bd123188b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6546 8144 bytes
font_01_sfnt_off000084e1.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04
pdf-font-stream PDF embedded font (sfnt) at offset 0x84E1 2616 bytes