Malicious PDF — malware analysis report

Static analysis result for SHA-256 7094466b6d1ca3c5…

MALICIOUS

PDF

52.5 KB Created: 2020-06-07 04:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 895b1e128dc2496da0f8679e5fa61f0d SHA-1: 7b64ac106749a384b34cc15ed567221481aaf5a6 SHA-256: 7094466b6d1ca3c5ccbe9594b83b8b7ef2056da17ee2cbd2743ca047fa397b69
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or a mechanism to distribute additional malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://thebusinesstip.com/uploads/1/3/0/4/130436127/130436127.html#soigner+un+zombie+villageois
    • http://mx.cityofbeaufort.com/uploads/1/3/0/2/130288731/fufazagop.pdf
    • http://triceconstruction.net/uploads/1/3/0/5/130550938/9434943.pdf
    • http://wickedladiesbees.com/uploads/1/3/0/2/130270921/newase_jonogegulekiwu_bovejedepalepi_barogoto.pdf
    • http://mta118.qualitynow.net/uploads/1/3/0/9/130969375/b5246f.pdf
    • http://mcexpress.ca/uploads/1/3/1/4/131454523/fosopunop-daxapeliridigeb.pdf
    • http://home.allywed.com/uploads/1/3/1/1/131163955/wewiwar.pdf
    • http://hostmaster.mikegriffiths.net/uploads/1/3/0/7/130776525/3aa01f.pdf
    • http://mta59.somekindofsimple.com/uploads/1/3/0/4/130476557/8081849.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ziximoki.files.wordpress.com/2020/06/57536872241.pdf
    • https://jabarimotemo.files.wordpress.com/2020/06/66907419072.pdf
    • https://xilunujasa.files.wordpress.com/2020/06/62727718183.pdf
    • https://zemijedo.files.wordpress.com/2020/06/46763902913.pdf
    • https://nexusif135210665.files.wordpress.com/2020/06/momopusokedowemuk.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009786.bin
364c9d4e6a27d1e0d8bace1e58c63928b62b5b639cf219dde76f83ed87df2e23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9786 15596 bytes

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