Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdec7f3330603b5…

MALICIOUS

PDF

37.2 KB Created: 2020-03-24 14:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 247d191b500b5b7f9f35e94bbebfd3b0 SHA-1: 4d22cbf0f1f4f5093e788f131f9a0dcedeeb1886 SHA-256: 2cdec7f3330603b5c91ce29547f61ecf079127be500cd228a8ee43dec937d520
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of embedded external links, characteristic of a link farm or SEO spam technique, designed to direct users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external PDF link farm. No scripts were extracted from this sample.

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://lennoxweb.com/uploads/1/3/0/3/130379175/130379175.html#room+on+the+broom+story+summary
    • http://hostmaster.avenue.org.uk/uploads/1/3/0/7/130776724/60a0fee2.pdf
    • http://chihuahuafrentealcambioclimatico.com/uploads/1/3/0/5/130551186/45cfbfaa7.pdf
    • http://abillingc.com/uploads/1/3/0/3/130313356/1094055.pdf
    • http://phmedicalskin.ikt24.no/uploads/1/3/0/6/130621664/xoroto_gogozozajokiv_jegurolosojuze_lenusuzepesikek.pdf
    • http://greatreeeducation.com/uploads/1/3/0/2/130270743/kulekogagoz_zovuzux_jinipogenam_wesutufe.pdf
    • http://www.fornowonjoyfield.com/uploads/1/3/0/6/130639021/wawumijujev.pdf
    • http://professionalbeveiliging.nl/uploads/1/3/0/7/130739595/4e5c628d.pdf
    • http://www.eca-engineering.com/uploads/1/3/0/7/130740489/3954147.pdf
    • http://portlandharborwatertaxi.com/uploads/1/3/0/7/130775034/ragizizosotuzu.pdf
    • http://kiara-163.com/uploads/1/3/0/7/130740364/3494417.pdf
    • http://voorlichtingsbureauexperientia.nl/uploads/1/3/0/5/130539305/8443041.pdf
    • http://constantspeedfineart.com/uploads/1/3/0/5/130539373/e69df.pdf
    • http://martazphotography.martazmusic.com/uploads/1/3/0/7/130740235/1377c169ad.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_off0000683a.bin
ac0c36feb3b19d67a11639150582a09b413e8bcd4194407e9b3e735a01737ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683A 7712 bytes

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