Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d6b22f9a2518ad…

MALICIOUS

PDF

49.7 KB Created: 2020-03-30 02:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed094f8b9167ce7917a497b0d5ae3aa0 SHA-1: 76dcfcc98475916f5f381db75661b8faa2074d26 SHA-256: 77d6b22f9a2518add7bfacee5d8ec4de30936cbdff1647129f6201eddda93a52
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are structured as SEO-optimized PDF lures. The document body text, though heavily obfuscated, contains references to 'ati nclex rn review book' and the authoring application 'wkhtmltopdf', suggesting a deceptive lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to direct users to potentially malicious content.

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://rehphotography.org/uploads/1/3/1/4/131456320/131456320.html#ati+nclex+rn+review+book
    • http://valecars.net/uploads/1/3/0/5/130551387/pixikafo.pdf
    • http://insurancewebsitedesign.net/uploads/1/3/0/7/130775310/zawokomelemifu-pubituwuf.pdf
    • http://bluecalliopepublications.com/uploads/1/3/0/6/130639467/6124188.pdf
    • http://rocheleautechnosoft.com/uploads/1/3/0/7/130738796/bcae85c111914.pdf
    • http://info.tomgisler.ch/uploads/1/3/0/7/130776737/4cce1601.pdf
    • http://nationalbusinesseducationweek.com/uploads/1/3/0/6/130603684/numomifibaninu.pdf
    • http://lobare.com/uploads/1/3/1/1/131164205/3468309.pdf
    • http://flytouchphotography.com/uploads/1/3/0/9/130969166/dabamigirel.pdf
    • http://clontarfbuildinghistory.com/uploads/1/3/0/5/130550844/vevewubo.pdf
    • http://sw-vacation-services.com/uploads/1/3/0/7/130776180/ferulutinup.pdf
    • http://successforsinglemoms.com/uploads/1/3/0/9/130969847/7073598.pdf
    • http://findadsrep.com/uploads/1/3/0/8/130874219/8811810.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_off00009880.bin
791698f8f84ae4cfc778739a3e988b2fe9c12d8d5251a215aac385338c5f8977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9880 8332 bytes

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