Malicious PDF — malware analysis report

Static analysis result for SHA-256 81390406e7fccd3d…

MALICIOUS

PDF

36.9 KB Created: 2020-04-29 23:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 48e10cb416bd7930a3acd12b6851ad6f SHA-1: df0148ae50e82b5adc8545ba93b59ba5d48a7c8e SHA-256: 81390406e7fccd3d64af6d160f5c4a128a1aa30f23cd4b7554c9a3b63988cac8
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a method to obscure malicious content. The primary lure appears to be a title related to watching movies without Wi-Fi, which is likely a social engineering tactic to encourage users to click on the embedded URLs. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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://manorofthyme.com/uploads/1/3/0/7/130776555/130776555.html#movie+and+watch+without+wifi
    • http://etccpa.org/uploads/1/3/1/4/131406473/6527932.pdf
    • http://ivyscleaningservices.com/uploads/1/3/0/4/130476200/bupugo-pijununi.pdf
    • http://crafts-by-nancy.shop/uploads/1/3/0/5/130550871/xupedi.pdf
    • http://keepthingspositive.com/uploads/1/3/0/4/130476981/086aa.pdf
    • http://initiativechanvre.com/uploads/1/3/0/7/130738484/folom_tanurafila_zupib.pdf
    • http://kirstenboydgoldberg.com/uploads/1/3/0/6/130604112/kulijawigada_palenub_jazub.pdf
    • http://inlandempiredefensegroup.com/uploads/1/3/0/6/130621593/fawimoz.pdf
    • http://iceboxskincare.com/uploads/1/3/0/4/130488569/407b871df.pdf
    • http://becomeafisherofmen.net/uploads/1/3/0/7/130776811/3480227.pdf
    • http://fernandinabeachinsurance.com/uploads/1/3/0/6/130639396/c590d9c6c2339.pdf
    • http://lnlcleaningservicesfl.com/uploads/1/3/1/4/131437402/banenakofeje_lozupu_jusaditatejak_vubav.pdf
    • http://flightrequest.org/uploads/1/3/0/7/130738701/refuwojexoxolu.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_off00006595.bin
b6041660a05a005599253a50a0c2fec35bd0795bfa01cb9caa12ed85a0107659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6595 8400 bytes

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