Malicious PDF — malware analysis report

Static analysis result for SHA-256 751f283a1ec6e56c…

MALICIOUS

PDF

42.6 KB Created: 2020-03-29 15:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b9ce138df15a9017345720e710079cc7 SHA-1: deb1829f3b9e436f3637516b6cd95eada33241a3 SHA-256: 751f283a1ec6e56cee0557280112d01a22759df1380652c63e63c867a201f508
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which appear to be SEO-optimized and lead to other PDF files. The document body text, though partially obfuscated, contains URLs that are likely intended to redirect the user to malicious websites. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to distribute content or malware.

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://74-123-75-235.mgwnet.com/uploads/1/3/0/9/130969086/130969086.html#en+busca+de+klingsor+pdf+libro+completo
    • http://recordlounge.net/uploads/1/3/0/2/130272462/5330635.pdf
    • http://621investments.com/uploads/1/3/0/6/130603980/mizomoxoxudo_rivumud.pdf
    • http://lloydalex.org/uploads/1/3/0/7/130739537/7979975.pdf
    • http://theteamexp.com/uploads/1/3/0/7/130775172/sawadid_powuvupus_bozov.pdf
    • http://kennethtannerbook.com/uploads/1/3/0/7/130775318/110784.pdf
    • http://ladygemini.studio/uploads/1/3/0/6/130620172/liveb-sugujuw-fogiwegelumel.pdf
    • http://jllnonprofits.com/uploads/1/3/0/8/130874397/311242.pdf
    • http://ballooncouturefashionshow.com/uploads/1/3/0/5/130543757/pasezeneb-dukamawavib-duwirozex.pdf
    • http://www.discountduniya.com/uploads/1/3/1/1/131164319/fupadipepulisubedigi.pdf
    • http://nex7.tv/uploads/1/3/1/4/131408917/9838340.pdf
    • http://terrifictripshome.com/uploads/1/3/0/5/130540284/8514450.pdf
    • http://my400poundlife.com/uploads/1/3/0/8/130873824/b453b2c9b25e4.pdf
    • http://newyorkcitycriminalattorney.net/uploads/1/3/0/7/130740084/gewal.pdf
    • http://chantalhairbraiding.net/uploads/1/3/0/6/130639379/bb44799e2f56e5.pdf
    • http://74-123-79-76.mgwnet.com/uploads/1/3/0/8/130874380/latizumelugegem-wokaneriz-refunedugun-sekopugolabizi.pdf
    • http://mrssecurityllc.com/uploads/1/3/0/6/130621123/a704f7eddf3.pdf
    • http://ljocustomcabinets.com/uploads/1/3/0/4/130436402/situlum-didagagigijokak.pdf
    • http://santamonica-chiropractors.com/uploads/1/3/0/3/130379367/ac66eedb.pdf
    • http://ms-wendys-class.com/uploads/1/3/0/5/130552043/1241500f23b.pdf
    • http://servingslore.com/uploads/1/3/0/2/130287852/195136.pdf
    • http://certifiedselfstorage.com/uploads/1/3/0/8/130813604/zidofato-nalire.pdf
    • http://alumnicareers.org/uploads/1/3/0/6/130640142/7966568.pdf
    • http://coincoingenieria.com/uploads/1/3/1/3/131380043/9198272.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_off000079ff.bin
645fe67b1b18fcc635072fa2e06fb21d5c2dee5eaee046966c59d034c841e387		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FF 9104 bytes

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