Malicious PDF — malware analysis report

Static analysis result for SHA-256 939517848ec06cc3…

MALICIOUS

PDF

45.3 KB Created: 2020-04-11 23:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9eca4302e83377cf5cf0b5b419519336 SHA-1: 40e56704035e54c2b64f3b86bf51e0ca35a5343a SHA-256: 939517848ec06cc34e2884c34f7b93beda399fad0c63d38060b30a0a404126a9
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body text, though partially corrupted, contains a reference to '1998 lexus ls400 service manual pdf', suggesting a lure for search engine optimization or content stuffing. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://irieint.com/uploads/1/3/0/2/130271157/130271157.html#1998+lexus+ls400+service+manual+pdf
    • http://tacbeaddazzled.com/uploads/1/3/0/5/130539235/2123971.pdf
    • http://www.theaspieroundup.co.nz/uploads/1/3/0/2/130291589/11cb5.pdf
    • http://jennifer-matt.com/uploads/1/3/0/3/130312913/punaxiwofogoj_weruvupavikigej_zeduxodap.pdf
    • http://simplysmittenlashes.com/uploads/1/3/0/9/130969763/fajaboku.pdf
    • http://cindyskombucha.com/uploads/1/3/0/7/130776738/383dde08.pdf
    • http://arapahoepainting.com/uploads/1/3/1/6/131636737/kibesukus_gazosak_senumirebifunu.pdf
    • http://audiobysamuel.studio/uploads/1/3/0/5/130589431/88863.pdf
    • http://taliamoore.com/uploads/1/3/0/6/130603873/dbc491d04adcc7c.pdf
    • http://rainbowsprinklescupcakery.com/uploads/1/3/1/4/131437308/mixaj-tuzebinisusever-tenagevadatobe-pamabakogapizin.pdf
    • http://copenhagen-bikes.com/uploads/1/3/0/2/130289406/3276112.pdf
    • http://santinibeauty.com/uploads/1/3/0/7/130740123/8296779.pdf
    • http://realestatesolutionshome.com/uploads/1/3/0/7/130739781/bec1bf4.pdf
    • http://goodbless.us/uploads/1/3/0/7/130740517/e7ad6.pdf
    • http://fsresearchdevelopment.in/uploads/1/3/0/5/130551981/giwegofa.pdf
    • http://glebecourt.org/uploads/1/3/1/3/131380081/7684318.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_off00008665.bin
b149a4655e1bd034b396a726d9175b165ef6b28b961f6cf843b4491dc3c26a56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8665 8652 bytes

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