Malicious PDF — malware analysis report

Static analysis result for SHA-256 1381914df0998f93…

MALICIOUS

PDF

43.7 KB Created: 2020-03-11 07:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9685a044eb3cd0437fd82c2b7b8b7e1c SHA-1: d6f60ecc7412f075eb442f2ba3d52820909ead5f SHA-256: 1381914df0998f934834a128c35057a8a7239026344709e9f9a5b323c5008d51
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified as a PDF link farm. The primary heuristic indicates this is a malicious SEO tactic, likely intended to drive traffic to potentially harmful sites or to host further malicious content. The ML classifier strongly supports the malicious verdict.

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://yulechengtikuansudukuai.br3h.com/uploads/1/3/0/6/130639528/130639528.html#legumes+bon+pour+acide+urique
    • http://thepurveyors.net/uploads/1/3/0/6/130620511/faxagimedu.pdf
    • http://www.inspectutahhomes.com/uploads/1/3/0/6/130639802/wuxujisexodexifuv.pdf
    • http://ghostwriterforyou.net/uploads/1/3/0/7/130775126/zoxokuxipejil_nitivo_kugirome_duduxigefoxi.pdf
    • http://dcelectrical.org.uk/uploads/1/3/0/4/130483337/puwipibewej_wixodibexiwab.pdf
    • http://jzsmartlife.com/uploads/1/3/0/4/130490117/87199b7e20f3b7d.pdf
    • http://roguethought.net/uploads/1/3/0/8/130874634/wilinumajo.pdf
    • http://bigbrightearth.com/uploads/1/3/0/4/130435781/4ad4347a1d5.pdf
    • http://autismmomspeak.com/uploads/1/3/0/9/130969402/94cb23f7.pdf
    • http://www.laphamstudio.com/uploads/1/3/0/4/130483770/besegizelumenepal.pdf
    • http://autodiscover.bayleerose.com/uploads/1/3/0/2/130289580/7107f7f9969.pdf
    • http://lrhkokea.com/uploads/1/3/0/3/130379711/fetexovi_bigibijufen_pagovowobivun_kajedaki.pdf
    • http://www.tidygoodlife.com/uploads/1/3/0/7/130738712/5397621.pdf
    • http://888claim15.org/uploads/1/3/0/8/130813651/zavawedanozusoxo.pdf
    • http://www.thebullstokemandeville.co.uk/uploads/1/3/0/3/130379137/fafa0e8.pdf
    • http://mapleshot.com/uploads/1/3/0/7/130739660/doxulisupekigekepiki.pdf
    • http://healthidea4u.com/uploads/1/3/0/2/130288565/zetizumaxilo.pdf
    • http://whitewatermark.com/uploads/1/3/0/6/130620184/razuvuxe-vifosasi-zoreduraxixel-lidojitemejexux.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_off00007e0b.bin
6593681a5a632577c49a6a069cbbfc1c6b75220d48fd6cb78b9640891ed327a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0B 9480 bytes

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