Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d2fa2d372afdd4…

MALICIOUS

PDF

45.9 KB Created: 2020-03-29 14:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c84e1710607ecff9de6ea5e8d44b7fe4 SHA-1: cbaa54938c430bd58e87586d607c5c93c6e7e2ce SHA-256: 86d2fa2d372afdd4a38bac9db6b69293683fc3dc7cf298dfad841ad15e131a82
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains. One of the embedded URLs, http://74-123-77-221.mgwnet.com/uploads/1/3/0/3/130379844/130379844.html#windows+vista+sp2+iso+64+bit, suggests a lure for downloading software. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the structure and numerous external links are indicative of a link farm or redirection scheme designed to deliver a payload.

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://74-123-77-221.mgwnet.com/uploads/1/3/0/3/130379844/130379844.html#windows+vista+sp2+iso+64+bit
    • http://acuvirtual.com/uploads/1/3/0/5/130543575/wotezij.pdf
    • http://northeastdrift.com/uploads/1/3/0/6/130604672/sibilox.pdf
    • http://lw-portfolio.com/uploads/1/3/0/6/130622111/0ffd44dc288a.pdf
    • http://deltachipurdue.com/uploads/1/3/1/3/131379168/notisuzof-taxigunebo-zebedusi-rugakimixikojub.pdf
    • http://fanniesauthentickombucha.net/uploads/1/3/0/9/130969925/59e0d2.pdf
    • http://littleladycafe.com/uploads/1/3/0/3/130312968/waduxek-vivopilap-dimutakej-givevumidaz.pdf
    • http://tuareapr.com/uploads/1/3/0/7/130738883/jugesodekigimup-didukase.pdf
    • http://alperulus.com/uploads/1/3/0/4/130489742/fuforumirewad-vuxak-jujunuwevuv.pdf
    • http://64hurleystreetu2.com/uploads/1/3/0/2/130274097/xazadubokuwuju_livededovunax_gofekulubaka_bepig.pdf
    • http://shphotoss.com/uploads/1/3/0/8/130874349/vezoretu_wizokolive.pdf
    • http://extendedcarriersinc.net/uploads/1/3/0/4/130435509/4208074.pdf
    • http://www.carowoods.co.uk/uploads/1/3/1/4/131407310/5014930.pdf
    • http://nebula-it-consulting.com/uploads/1/3/0/5/130545278/48e59253c1e35c4.pdf
    • http://alloneocean.net/uploads/1/3/1/3/131379498/4a6b40328a86a.pdf
    • http://aclsrwa.com/uploads/1/3/0/6/130604737/2562404.pdf
    • http://investnurself.com/uploads/1/3/1/1/131163653/9915030.pdf
    • http://liftexpertrobeli.ch/uploads/1/3/0/5/130590273/lolujewedufekud.pdf
    • http://shutterupphotography.net/uploads/1/3/0/8/130874238/6401448.pdf
    • http://stlouisattorney.net/uploads/1/3/0/6/130620556/fanadoxuxutojof-vakilinaw.pdf
    • http://belkablossoms.com/uploads/1/3/0/7/130738989/roxapokegukipi-zawakosavefu.pdf
    • http://purush.com/uploads/1/3/0/2/130272552/zelodozowijizorap.pdf
    • http://delawaretechhire.org/uploads/1/3/0/6/130604626/5b15806.pdf
    • http://brightstudents.net/uploads/1/3/0/5/130588905/kefubip.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ec7.bin
d8e63d55f9fd562ce5709a7deb0a7aec6fc883c65bc5378c39f7e83014475e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC7 8768 bytes
font_01_sfnt_off00009e70.bin
1b3f82cd74c5b6671cc0c0d4a6c7877b74bb57ca469b2a61ef541918e41af838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E70 2652 bytes

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